European Transport Research Review

, Volume 6, Issue 4, pp 439–453 | Cite as

The study of the possibility of switching driving side in Rwanda

  • Md Mahabubul Bari
Open Access
Original Paper


Harmonisation of driving laws of Rwanda with the surrounding East Africa Community (EAC) countries, which mostly drive on the left-hand side of the road, would lead to improved links between these strategic trading partners. A study to assess techno-economic viability of switching drive side from the right to left was therefore undertaken during February to August, 2009. A bottom-up approach involving wide ranging public consultation at each stage was employed. Two alternative scenarios, (i) a Do Nothing (DN) option, i.e. continue to drive as it is in the right hand side and a Do Something (DS) option, which means switching driving side from right to left were developed for an evaluation period of 20 years. All of the foregoing factors (vehicle demand projection, cost of vehicle purchase and maintenance, accidents, business interests between Rwanda, EAC and Common Market of East and Southern Africa (COMESA) countries and other neighbours) have been evaluated for the next 20 years for both options, including the financial, economic and safety impacts. According to the study if decision were made to switch despite minor increase in material only damage accidents, overall economic and financial benefit would be very substantial, which is also supported by the majority of the stakeholders (54 %).


Driving side RHD and LHD vehicles Incremental accidents Vehicle import and operating costs Economic integration Net economic and financial impacts 

1 Introduction

Since the ban on importing right-hand drive (RHD) vehicles was imposed in 2005, the costs of vehicle purchase and maintenance in Rwanda have increased. This is apparently because of the fact that Japanese second hand vehicles, which are mostly right-hand drive and constitute the largest percentage of car imports (64 %) in Rwanda, are significantly cheaper than European left-hand drive (LHD) vehicles [18]. Apart from the Democratic Republic of Congo (DRC) and Burundi, Rwanda’s key neighbouring countries, i.e. Uganda, Tanzania and Kenya, which form the majority of the East African Community (EAC), all drive on the left-hand side of the road. Harmonisation of driving laws with the surrounding EAC and other Common Market of East and Southern Africa (COMESA) countries may lead to improved transport links between these strategic trading partners.

Considering issues listed above, the Government of the Republic of Rwanda through the Ministry of Infrastructure (MININFRA), has undertaken a techno-economic feasibility study of the impacts of switching driving side in Rwanda. This paper describes the methodology, findings, conclusions and recommendations of the study.

2 Objectives of the Study

The key objectives of the study are as follows:
  1. (i)

    To conduct literature review and stakeholder consultations to identify key problems/variables for switching driving side;

  2. (ii)

    To collect and collate past accident and traffic data, and to conduct additional surveys for the study as per requirements of the study;

  3. (iii)

    To assess the techno-economic and financial feasibility of switching driving side;

  4. (iv)

    To determine the local, regional and institutional constraints and operational modalities for switching driving side;

  5. (v)

    To ensure wide-spread public participation in the decision making process for switching driving side; and

  6. (vi)

    To recommend appropriate policy guidance on switching driving side.


3 Methodology

The study adopted a bottom-up approach. Under the approach, efforts were made to involve general citizens/stakeholders to participate in every step of the decision making process of the driving side study starting from the identification of key variables/problems, perception about different impacts, development of alternatives and recommendations for potential solutions. To determine the optimum solution, a Cost-Benefit Analysis (CBA) was undertaken to estimate the equivalent money value of the aggregate benefits and costs to the community of different alternative driving side options. The whole process involves a number of steps under different work packages as follows:
  1. (i)

    Review of driving laws of Rwanda and neighbouring countries with respect to driving side;

  2. (ii)

    Identification of relevant attributes/problems related to switching;

  3. (iii)

    Selection of the portfolio of options;

  4. (iv)

    Collection of primary and secondary data related to driving side;

  5. (v)

    Prediction of quantitative impacts over the evaluation period of 20 years;

  6. (vi)

    Public perception about key variables of switching driving side;

  7. (vii)

    Monetization (attach monetary values to) all impacts;

  8. (viii)

    Assessment of overall economic and financial impacts;

  9. (ix)

    Identification of the distribution of costs and benefits.

  10. (x)

    Assessment robustness of economic and financial; and

  11. (xi)

    Stakeholder consultation


The methodology for estimating each variable is elaborated under different work packages in the following sections.

4 Work packages for the study

4.1 Review of regulations for driving side in Rwanda and other neighbouring countries

This study conducted a comprehensive review of the existing driving laws, policy and regulatory framework in Rwanda and other neighbouring countries for assessing what would be necessary if decision were made for switching driving side considering legal points of view.

According to a list of which side of the road people drive on around the world, out of 239 countries in the list 164 (68.6 %) countries drive on the right side of the road whereas 75 (31.4 %) countries drive on the left side of the road [13]. Despite overall numerical dominancy of the countries driving on the right hand side of the road in the world, the actual operational and economic advantages of a particular type of vehicle with respect to driving side vary in different regions of the world.

Prior to 2005, Rwandans could import and purchase vehicles with steering wheels on either the right or the left. However, the 2005 Presidential decree specified that only left hand drive (LHD) vehicles were permitted to be imported into and purchased in Rwanda, to reduce traffic accidents and improve road safety, particularly with regards to public transport [11].

Although road systems in Rwanda and Burundi are designed to support driving on the right hand side of the roads, majority of the vehicles in these countries were odd vehicles, i.e. RHD vehicles before 2005. The proportion of RHD vehicle in Rwanda prior to imposition of ban was as high as 99 % [18]. Since the ban came into effect in 2005, the proportion of RHD vehicles were plunged from 99 % to a 42 % in 2009 due to combined impacts of import ban and conversion of 15 % of RHD vehicles into LHD. Since there is no restriction on RHD vehicles in Burundi, the majority of vehicles in Burundi are still odd RHD vehicles. The numbers of odd RHD vehicles are also significant in many left hand drive regions, such as Russia and British Columbia in Canada [4]. It is a research issue to investigate why there was overwhelming dominance of odd RHD vehicles in some left hand drive regions, such as Rwanda before the imposition of the import restrictions.

In the East African Community (EAC) most of the economically dominant countries like Uganda, Tanzania and Kenya drive on the left-hand side of the road. On the other hand, smaller economies like Rwanda and Burundi drive on the right side of the road.

According to Association of Rwanda Forwarders and Clearing Agents, the ban of RHD vehicle had negative effects on the economy and scared investors in the transport sector [12]. Foreign cargo haulers account for over 70% of the total number of trucks (about 5,025) that deliver cargo in the country, partly because they are cheaper to hire. Rwanda is a landlocked country and is totally dependent of the seaports of Kenya and Tanzania for overseas trading. Out of an estimated 1,600 km from Mombasa to Kigali, it is only between Gatuna to Kigali where drivers switch driving sides from left to right for a stretch of 70 km.

Highways built under the coordination of EAC Secretariat especially those linking countries with different driving sides, such as Tanzania and Burundi or Uganda and Rwanda do not even have special inter-connecting hubs to switch motorists from left to right and vice versa. Harmonisation of driving laws with the surrounding EAC and other Common Market of East and Southern Africa (COMESA) countries may lead to improved transport links between these strategic trading partners. Since its entry in the East African Community (EAC) Rwanda has been on the frontier of adapting to standards of the community, and the country is now considering the shift of traffic rules from the right hand to the left hand drive.

Many countries/territories of the world switched driving side for various reasons including harmonisation transport system with dominant neighbouring countries. Notable among them are Austria, Czechoslovakia, Hungary, Channel Islands, Falkland Islands, Sweden, Nova Scotia, Myanmar, Nigeria and Samoa, etc. The lessons learnt from these countries could be very useful if decision were taken to switch driving side in Rwanda [13].

It appears from the literature review that there are still some knowledge gaps in the key areas of switching driving sides in different parts of the world. Some of crucial areas where further study is needed are as follows:
  • Dominance of odd vehicles with respect to driving side in many parts of the world including Rwanda;

  • Incremental impacts of accidents for driving odd vehicles with respect to driving side; and

  • Public perception about driving an odd vehicle having a steering wheel in opposite side of control.

4.2 Identification of Key variables and development of Dn and Ds scenarios

After conducting the literature review and wide stakeholder consultations, key variables affecting the possibility of switching driving side were identified. The key variables are as follows:
  1. (i)

    Schedule for switching;

  2. (ii)

    Interaction between policy variables;

  3. (iii)

    Decay period of odd vehicles;

  4. (iv)

    Vehicle import costs;

  5. (v)

    Vehicle operating costs;

  6. (vi)

    Demand for vehicle import;

  7. (vii)

    Impacts on road accident

  8. (viii)

    Experience from other countries;

  9. (ix)

    Public perception about switching driving side; and.

  10. (x)

    Stakeholders’ view including drivers, transport operators, vehicle importers as well as general road users.

In order to assess the potential impacts of switching driving side from right to left, two alternative options were selected for the study after organising two workshops involving general public and key stakeholders:
  1. (i)

    A Base Case or Do Nothing (DN) scenario considering the business as usual situation, where existing driving side would remain unchanged; and

  2. (ii)

    A Do Something (DS) Scenario for switching driving side from right to left.


The main objective of the study was therefore to conduct a techno-economic and financial analysis of the mutually exclusive DN and DS options and to recommend appropriate policy directives.

4.3 Data collection

Both primary and secondary information collection exercises were employed for the study. A significant amount of information for the study was collected from local and international sources, including technical journals, databases of Rwanda Revenue Authority, vehicle importers, insurance companies and other private and public sources. Interviews were employed to obtain primary data from respondents for the study.

4.3.1 Design of questionnaires

Three questionnaires were devised as follows:
  1. i.

    First questionnaire survey to collect data on vehicle type, characteristics, purchase and operating costs, accident records, and perception about driving side, etc.;

  2. ii.

    Second questionnaire survey at border crossings to collect data on the origin of vehicle registration and steering wheel side for all types of vehicles;

  3. iii.

    Third questionnaire survey on data related to different accident cost components for different types of accidents in Rwanda, i.e. property damage costs, administrative costs, lost output costs, medical costs, and human costs.

The first questionnaire, involving 1,068 respondents, consisted of questions on a number of key attributes as follows:
  • Vehicle type;

  • Capacity of vehicle engine (in cubic centimetres);

  • Vehicle purchase and maintenance costs;

  • Driving side;

  • Conversion of driving side;

  • Opinion on difficulty of driving a RHD vehicle;

  • Incremental accident due to driving RHD vehicles; and

  • Whether respondents supported switching driving side or not, etc.

There are ten vehicle classes in Rwanda: car, jeep/4 wheel drive, pick-up, minibus, bus, 2-axle truck, 3-axle truck, articulated truck, trailer truck and motorcycle. Since it was necessary to collect representative data from all vehicle classes, a stratified random sampling technique was employed to survey vehicle operators, drivers and importers.

To collect a statistically significant sample from each stratum under a stratified random sampling technique, the sample size for the questionnaire survey was determined as follows [2]:
n N * p * 1 p N 1 * D + p * 1 p
D = Confidence . Interval 2 Z 2

Sample size


population size (the size of the population of each strata from which the sample to be selected at random)


Prior assumption, which is the proportion of respondents one would expect to answer a question a certain way. In this study it represents the proportion of respondents who can answer the questions correctly


Area under normal curve corresponding to the desired confidence level (CL).

The statistically significant sample sizes for each stratum in accordance with Equation 1 with 95 % confidence level and assuming 95 % of expected correct responses from the respondents are shown in Table 1.
Table 1

Study sample sizes for general questionnaire survey

Vehicle Type

Total Population

Population (50 %) in Study Area

Proportion of respondents who can answer correctly


D Value (95 % CL)

Minimum Sample Size Required

Study Sample size

























Trailer Truck
































Articulated Truck
















The second questionnaire survey was undertaken to ascertain the distribution of the origin of vehicle registration and steering wheel side at eight main border crossings of Rwanda. The survey was conducted for 24 h in a typical weekday for each border crossing. A simple random sampling technique was employed for conducting questionnaire surveys at border crossings. Efforts were made to collect at least 30 random samples from each border crossing to ensure normal distribution of the origin of vehicle registration data. However, due to a lack of sufficient number of vehicles at three border crossings during the time of the survey, it was not possible to attain the minimum requirement at these border crossings. The sample sizes for different vehicle types of the questionnaire survey at border crossings are shown in Table 2.
Table 2

Sample sizes for questionnaire survey at border crossings

Name of Border Crossing

Minimum Sample Size Required

Study Sample Size




























In addition, a third questionnaire survey involving 150 respondents was undertaken with vehicle importers, doctors, insurance companies and other stakeholders to determine accident costs for different types of accidents. Documentary/database sources were also used, such as local and international surveys, technical journals, and databases of the Rwanda Revenue Authority, vehicle importers, insurance companies and other private and public sources.

Moreover, for determining and quantifying road elements, signs, signals and other road furniture to be adapted for left-hand driving, a survey was undertaken covering 1,172 km of National paved road network and 150 km of paved road network of Kigali City. The survey was conducted by a team of road geometry and traffic engineers using inspection vehicles mounted with automatic geometric coordinate and video recording devices. In addition of video and geometric coordinate recordings of roadways, the numbers and type of road sign, signal, signal flare or other road furniture to be adapted for left-hand driving were counted using hand-held computers during the survey.

4.4 Vehicle forecasts

4.4.1 Normal vehicle growth under DN scenario

Based on the classified vehicle registration data of the Rwanda Revenue Authority from 2003 to 2008, cumulative number of vehicles up to 2008 with respect to driving side was obtained [18]. However, this data does not provide any information about the percentage of RHD which were converted into LHD after the Presidential Circular of 2005. The percentage of vehicle conversion data was obtained from the field surveys. The reference year (2009) vehicle level and composition were estimated from cumulative vehicle data of 2008 using trend extrapolation of previous vehicle data.

The projections for vehicle levels till the end of the evaluation period of 20 years (2009 to 2028) were estimated using available primary and secondary sources of information. Initial vehicle growth rate for the first 5 years was obtained using trend extrapolation past vehicle data. The vehicle growth rate under long term scenario was obtained from the upper traffic forecast of the Feasibility Study Report of Kigali Urban Road Upgrading Project [3].

Quantifying uncertainties in vehicle growth projections is generally undertaken using detailed local information obtained from appropriate field surveys. Considering the limited scope of the study, it was not necessary to embark on a detailed vehicle demand forecasting exercise. Instead, a Department for Transport [9] recommended approach was employed. The different probabilistic scenarios for vehicle growth rates used for demand projections are presented in Table 3.
Table 3

Vehicle growth rates under different probabilistic scenarios


Vehicle Growth Rate (%)





7.20 %

12.20 %

2.20 %


6.90 %

14.40 %

−0.60 %


6.20 %

15.88 %

−3.48 %


6.10 %

17.00 %

−4.80 %

4.4.2 Development and calibration of vehicle decay model

In order to predict the number of odd RHD vehicles during evaluation period, it is essential to determine the annual vehicle conversion rates. The average weighted conversion rates from RHD to LHD for all types of vehicles from 2005 to 2009 were obtained from the questionnaire survey and vehicle registration database of Rwanda Revenue Authority [18]. The vehicle conversion rates were used to calibrate a logistic decay model. The mode was developed to represent conversion process of odd vehicles for 15 years by trial and error method. The logistic vehicle decay model is given by:
D t = 1 1 a * exp b * N t 1
D t

decay of vehicle number in percentage at a certain time period, t


maximum time period for complete elimination


time period, which varies from 0 to N-1


b, model parameters.

The calibrated model parameters, a and b were estimated as 0.6 and 0.12 respectively by trial and error method. The actual and the projected conversion rates for RHD vehicles into LHD vehicles from 2006 to 2009 are shown in Table 4. The Goodness of fit between the actual and the modelled conversion rates in terms of Adjusted R Square is 0.925. This indicates a strong correlation and hence the adequacy of the logistic delay model (Equation 2) to represent the vehicle conversion process. The calibrated vehicle conversion model is demonstrated in Fig. 1.
Table 4

Actual and Projected Conversion Rates of Odd RHD Vehicles from 2006 to 2009


Actual Conversion Rate (%)

Projected Conversion Rate (%)


10.82 %

11.01 %


12.50 %

12.59 %


14.25 %

14.43 %


15.00 %

16.57 %

Fig. 1

Calibrated Vehicle Decay Model for Rwanda

Since the ban came into effect in 2005, the proportion of RHD vehicles has plunged from 99 % to a 42 % in 2009 due to combined impacts of import ban and conversion of RHD vehicles into LHD.

4.4.3 Vehicle import costs

In economics, the law of demand states that, all else being equal, as the price of a product increases quantity demanded falls; likewise, as the price of a product decreases, quantity demanded increases [14]. Since average import cost of RHD vehicle in Rwanda is generally lower [18], it is likely that some additional vehicle will be imported under a DS Scenario.

In order to determine the additional or generated vehicles, costs for different categories of vehicle were collected by conducting a questionnaire survey of the vehicle importers, operators and drivers. The vast majority (91 %) of imported vehicles are second-hand and almost three quarters (74 %) of all imported vehicles are more than 10 years old as shown in the vehicle age distribution in Fig. 2. In order to obtain representative prices of imported vehicles under different categories, a weighted average price for both LHD and RHD vehicles under a particular category was estimated on the basis of mean vehicle import price with respect to each age category, multiplied by the corresponding percentage of age distribution, and finally added them together for all age groups.
Fig. 2

Age Distribution of All Categories of Imported Vehicles (except motorcycles) during 2008 in Rwanda (Source: Rwanda Revenue Authority)

It is evident that the average purchase cost of RHD vehicles is 16.34 to 48.69 % lower than LHD as shown in Table 5. This might be because of the vast majority of imported vehicles (64.3 %) are second hand RHD Japanese vehicles as illustrated in Fig. 3. The market share of Indian RHD vehicles is only at 6.8 %. The combined market share of vehicles of Japanese and Indian vehicles is 71.1 %, which far higher than the EU, which has a 16.7 % market share. It was observed from the database of Rwanda Revenue authority that second hand European vehicles are significantly more expensive than Japanese or Indian vehicles of similar age [18].
Table 5

Weighted mean financial import costs of different categories of LHD and RHD vehicles in Rwanda in 2009

Vehicle Type

LHD (in USD)

RHD (in USD)

Difference (in USD)

% Difference





23.65 %

Pick up




17.01 %





46.82 %





30.91 %





48.69 %

2-Axle Truck




48.62 %

3-Axle Truck




16.34 %





20.00 %

Trailer Truck




19.35 %

Fig. 3

Distribution of Vehicle Manufacturers by Country (Source: Rwanda Revenue Authority)

4.4.4 Vehicle operating costs

The vehicle operating cost data was collected as a part of the 1st Questionnaire survey involving 1,068 respondents. All the relevant key attributes for the vehicle operating costs were collected, as follows:
  • Vehicle type;

  • Capacity of vehicle engine (in cubic centimetres);

  • Driving side;

  • Age of Vehicle;

  • Fuel Consumption cost per month;

  • Lubricant consumption cost per year;

  • Spare parts and tyre consumption cost per year;

  • Other maintenance cost per year;

  • Vehicle import cost;

  • Average service life and salvage value (for determination of Depreciation cost per year).

The research in this study shows that total vehicle operating and maintenance costs of the whole spectrum of RHD vehicles are 5.5 % to 38.5 % cheaper than comparative LHD vehicles as illustrated in Table 6. It appears from the questionnaire survey that Japanese vehicles, which are available in Rwanda, are generally more fuel efficient and cheaper spare parts for these vehicles are more readily available in the EAC region.
Table 6

Comparison of monthly vehicle operating costs between lhd and rhd vehicles in rwanda

Type of Vehicle

% Difference between LHD and RHD

Monthly Fuel Consumption (Litre)

Monthly Fuel and Lubricant Cost (USD)

Monthly Repair and Maintenance Cost (USD)

Monthly Total Vehicle Operating and Maintenance Cost (USD)


−8.3 %

−40.2 %

−32.5 %

−38.5 %


14.9 %

39.6 %

−65.5 %

−31.7 %


9.2 %

−2.8 %

−16.0 %

−5.5 %


27.5 %

−24.1 %

−3.9 %

−22.7 %


0.0 %

0.0 %

0.0 %

0.0 %


−5.1 %

−28.6 %

−0.9 %

−21.3 %


−4.6 %

−17.2 %

1.4 %

−15.2 %


0.0 %

0.0 %

0.0 %

0.0 %


0.0 %

0.0 %

0.0 %

0.0 %

4.4.5 Impacts on demand for vehicle import

Price elasticity of demand (PED or Ed) is a measure used in economics to show the responsiveness, or elasticity, of the quantity demanded of a good or service to a change in its price [14]. Given the significantly lower costs associated with RHD vehicles, some generated demand for RHD vehicles is expected under the DS scenario in accordance with the price elasticity of demand. The projected generated vehicle demand for each vehicle class was obtained for the evaluation period (2009 to 2028) using vehicle price elasticity of demand of −0.3 [19, 5]. The overall number and composition vehicles under normal growth for both DN and DS scenarios will be 181,554 and the generated vehicles for the DS scenario during the evaluation period will be 29,463, which represent an additional 16 % increase as demonstrated in Table 7.
Table 7

Normal and generated vehicle under ds scenario


Normal Vehicles

Generated Vehicles

Normal + Generated Vehicles

% of Odd LHD vehicles
















52.99 %









19.26 %









2.88 %









0.01 %









0.00 %

4.5 Prediction of road accidents under different scenarios

4.5.1 Prediction of normal accident growth in Rwanda

To predict normal accident growth during the evaluation period (2009 to 2028), the study collected the number, type and severity of accidents from 2002 to 2008 in Rwanda from the accident database of Rwanda National Police [16]. In total data for four types of accident from two main categories were collected as, follows:
  1. i.
    Property Damage only accident:
    • Minor (accidents on public roads involving at least one vehicle and resulting in material damage only without any human injury or death with a value of less than or equal to USD 100);

    • Major (accidents on public roads involving at least one vehicle and resulting in material damage only without any human injury or death with a value of more than USD 100);

  2. ii.
    Personal Injury accident:
    • Injury (accidents on public roads involving at least one vehicle and resulting in human injury);

    • Fatal (accidents on public roads involving at least one vehicle and resulting in human death);

The annual statistics of road accidents in Rwanda from 2002 to 2008 are shown Table 8.
Table 8

Annual statistics of road accidents in rwanda (Source: [16])

Accident type/Time Period (year)

Property Damage only accident

Personal Injury accident
















































On the basis of past accident data, the changes in accident rates for different types of accidents were estimated employing an empirical formula as follows [6].
A N = A 0 x β N

the accident rate or number of casualties per accident N years after base year


the accident rate or number of casualties per accident in the base year


accident change rate coefficient raised to the power N (the number of years after the base year).

The accident change rate coefficients, β for different type of accidents were estimated using accident data for 2002 to 2008. The average accident change rate coefficients, β over the period of 2002 to 2008 were employed for the prediction of different types of normal accidents over the evaluation of period of 2009 to 2028. The values of change rate coefficients for different types of accidents are shown in Table 9.
Table 9

Accident rate change coefficient for different types of accidents

Accident Rate Change Coefficients







2002 to 2003






2002 to 2004






2002 to 2005






2002 to 2006






2002 to 2007






2002 to 2008






4.5.2 Prediction of incremental impacts of driving side on road accidents in the world

Despite imposition of ban on importation of RHD vehicle in Rwanda in 2005, a significant portion of vehicles are RHD, representing 42 % of the vehicle fleet in 2009. These odd vehicles pose significant safety risks. However, the accident records currently available in Rwanda do not provide information on accidents potentially caused by RHD vehicles. Globally, very few studies have been conducted to address safety issues related to driving with opposite-side controls. Notable among them are:
  1. (i)

    Study on safety of RHD vehicles in British Columbia, Canada [4];

  2. (ii)

    Dangers and Solutions of LHD HGVs in the UK, [17].


Study on safety of RHD vehicles in British Columbia, Canada

Out of the two studies, the study conducted in British Columbia is very comprehensive in dealing with potential accident implications related to driving with opposite side controls and vehicle age. Both in British Columbia and Rwanda the road infrastructures are designed and built for LHD vehicles but there are significant numbers of RHD vehicles operating in the road network. Considering the striking similarity between operational conditions, as far as driving side is concerned and proliferation of relatively cheaper Japanese second vehicles in both the cases, it might be appropriate to employ findings of the study to project incremental accident implications of driving older vehicles with opposite side controls on road accidents in Rwanda. The design of this study included three separate methodologies to assess safety risks of RHD vehicles. The methodologies included: (1) a relative risk comparison of culpability for crashes of individual drivers for RHD vs. LHD vehicles; (2) survival analysis to determine if an increased risk was associated with the early driving periods for RHD vs. LHD vehicles; (3) Poisson regression analysis to compare RHD driver risk to a LHD driver control group. In addition to estimation of vehicle crash involvement risk, comparison of crash severity for RHD and LHD vehicles was undertaken as part of the first, i.e. a relative risk comparison of culpability for crashes and the third methodology, i.e. Poisson regression analysis.

It appears from the comparative analysis of the results from three different approaches that the results were consistent and very similar.

Considering the conclusive evidences from the results of the British Columbia study and the similarity between existing driving environment of British Columbia and Rwanda, it was decided to adopt the same 37 % incremental impact of driving RHD vehicles on material damage only accidents, as obtained from Poisson Regression analysis, for Rwanda. Since there was no statistically significant increase in severity of accident in British Columbia due to driving with opposite control, no increase in rate of injury or death was assumed in Rwanda as well.

Accident analysis for LHD HGVs in the UK

Although British Columbia study conducted a comprehensive study on incremental impact of driving with opposite side control, the study did not provide adequate clue about different vehicle category specific risk. This is particularly relevant for HGV’s, which tend to have a far higher risk of turning and weaving collisions. The impact of the latter situation was ascertained from the reported UK crash statistics [8] which clearly point to an increased risk of turning and weaving collision involvements for LHD vehicles in the RHD environment.

In order to assess the overall incremental accident risks of LHD HGV’s while driving in the RHD environment in Great Britain, a relative risk analysis in terms of Odds Ratio Analysis was undertaken with respect to relative annual vehicle-km driven by UK registered HGV’s as against foreign registered HGV’s, number of reported road accidents involving (i) at least one heavy goods vehicle and (ii) at least one foreign registered heavy goods vehicle in Great Britain in a typical year. The relevant tonne-kilometres and vehicle-kilometres data for UK registered as well as foreign registered vehicles were derived from DfT Road Freight Statistics [7] as revised in 2008 [10], and corresponding accident data for HGV’s during 2005 to 2007 were collected from DfT’s annual publication ‘Road Casualties Great Britain’ in from [6] to 2008. The Odds Ratios, which are equivalent to relative risks, for personal injury accidents of LHD HGV’s while driving in left side in the UK were estimated in relation to proportional annual vehicle-km driven. The average Odds Ratios for slight injury, serious injury and fatal accidents for LHD HGV’s during 2005 to 2007 were 1.69, 1.16 and 1.10 respectively. This implies that the LHD HGV’s were 69 %, 16 % and 10 % more at risk of participating a slight injury, serious injury and a fatal accident respectively than RHD HGV’s in the UK. The weighted average Odds Ratio for personal injury accident was 1.61 indicating that relative risk of driving LHD HGV’s having opposite steering wheel control was 61 % higher in comparison to RHD HGV’s in the UK. The same relative incremental risks for personal injury (+61 %) and fatal (+10 %) accidents were adopted in the present study for determination of accident impacts of HGV’s, having opposite-side steering wheel control, in Rwanda.

4.5.3 Public perception about impacts of driving side on difficulty in driving and road accidents in Rwanda

Perception about difficulty in driving

As a part of the First questionnaire survey, drivers’ perceptions about difficulty in driving with RHD vehicles were collected from direct interviewing. When asked their opinion regarding the most likely constraints a driver would face while driving a RHD vehicle in the LHD traffic system of Rwanda, the overwhelming majority (67.9 % to 93.0 %) did not consider it to constitute a problem for any major driving manoeuvres as demonstrated in Table 10.
Table 10

Drivers’ perception about constraints of driving rhd vehicles in rwanda


No of Responses

Percentage Distribution of Responses

Degree of Constraint








Difficulty of driving in straight roads





12.9 %

1.8 %

85.2 %

Manoeuvre for overtaking





19.6 %

12.4 %

67.9 %

Change of lanes





17.3 %

3.1 %

79.5 %

Negotiation at junctions





21.8 %

2.6 %

75.6 %

Negotiation at curves





14.1 %

3.1 %

82.8 %

Negotiation at grades





5.4 %

1.7 %

93.0 %

Perception about traffic accidents

Drivers’ perceptions about incremental impacts of driving on the right-hand side of a road with a RHD vehicle in Rwanda were generally consistent with findings on other international studies, notably the study on safety of RHD vehicle in British Columbia. The vast majority of respondents (68.4 %) think the incremental impact of driving a RHD vehicle in Rwanda is less than 5 %. Although the questionnaire survey did not distinguish between material damage only and personal injury accident, it demonstrates overall incremental accidents, according to public perception, are low (less than 5 %) as shown in Table 11 and the range is likely to remain within 5 to 40 % similar to that of the British Columbia study.
Table 11

Drivers’ perception about incremental impacts on accidents for driving a rhd vehicle in Rwanda

Accident rate

Percentage of Responses

Accident rate

Percentage of Responses

Accident rate

Percentage of Responses

< 5 %

68.4 %

6–10 %

18.8 %

11–15 %

3.7 %

16–20 %

3.3 %

21–30 %

1.2 %

31–40 %

1.3 %

41–50 %

1.0 %

51–60 %

0.6 %

61–70 %

0.5 %

71–80 %

0.4 %

81–90 %

0.3 %

91–100 %

0.5 %

101–200 %

0.0 %

201–300 %

0.0 %

> 300 %

0.2 %

4.5.4 Results of incremental accidents for Odd vehicles

It appears from the results of accident analysis that all types of accidents increased under DS scenario. This is because it has 54 % more odd vehicles in comparison to DN scenario. It is evident that under DS scenario, there would be a net increase of 402 numbers of all type of accidents added together as demonstrated in Table 12. It may be mentioned here that increase of accidents for both DN and DS scenarios due to odd vehicles appear to be marginal in a period spanning over 20 years during the evaluation period. The increase in accidents would likely to be limited to minor and material damage only accident category.
Table 12

Incremental impacts of odd vehicles on all types of road accidents (During 2009 to 2028)

Vehicle Type

All Accidents
























2-Axle Truck




3-Axle Truck




Articulated Truck












4.6 Evaluation of monetary costs of accidents

The cost of accidents can be evaluated in general in three different ways:
  1. (i)

    Willingness-to-pay (WTP)

  2. (ii)

    Value of a life year (VOLY)

  3. (iii)

    Gross Output or Human Capital Method.

The main advantage of Human Capital Method lies in its simple and transparent calculation concept. Considering this advantage and relative ease of application, the human capital method similar to that of the Accident Cost Study of Cambodia [1] was adopted and used to determine the different components of costs of road accidents in this study, as follows:
  1. (i)

    property damage;

  2. (ii)

    administration costs;

  3. (iii)

    costs of medical services;

  4. (iv)

    output lost; and

  5. (v)

    human costs, such as pain, grief, and suffering.


The different elements of the accident costs were collected from the questionnaire survey. On the basis of Human Capital Method, the total accident costs were USD 9,379 for a fatal casualty and USD 4,175 for an injured casualty. The corresponding figures for major and minor material damage were USD 268 and USD 86 respectively.

4.7 Determination of different monetary costs and benefits for alternative scenarios

4.7.1 Benefits at border crossings and competitiveness of Rwandan transporters

Travel time benefits

From the survey data collected at border crossings, two thirds of all 279 vehicles (65.9 %) were RHD. In the case of Rwandan vehicles, barring exceptions at Gatuna and Kagitumba, the majority (57.6 %) of the vehicles were RHD indicating potentials for time savings if EAC economic and custom integration continues.

Assuming a 5 min time saving per vehicle for not changing road driving lane in the case of EAC custom integration, the net economic benefit over the evaluation of period due to time saving will be USD 0.68 million, which is 32 % more than that of the projected benefit of DN scenario.

Competitiveness of Rwandan transporters for international shipment of goods

According to the vehicle registration surveys at border crossings, in comparison to the number of foreign transporters (mainly from Uganda, Kenya and Tanzania which generally use RHD vehicles) the proportion of Rwandan transporters is relatively low. The surveys at border crossings found that 72.5 % of the vehicles transporting goods and passengers at border crossing were foreign-registered vehicles and 69 % of them were RHD vehicles.

Additionally, the shares of import, export and re-export of goods transported by Rwandan vehicles in 2006 were 40 %, 38 % and 22 % respectively, indicating dominance of foreign registered and predominantly RHD vehicles in regional transportation of goods [15]. Since the bulk of trade is destined for the ports of Dar es Salaam and Mombasa, it would be advantageous to employ RHD vehicles to encourage international trading.

4.8 Assessment of overall techno-economic viability for switching driving side with respect to economic profitability indicators

4.8.1 Economic evaluation

The cost and benefit streams for each alternative under the DN scenario were calculated for each year of the evaluation period. An economic appraisal has been carried out for each of the cost components separately as well as for all the attributes taken together. On the basis of this, it is evident that despite some minor and temporary drawbacks attributed to accident, conversion and signage costs, switching driving side from right to left in Rwanda is highly profitable with a net economic benefit in terms of Net Present Value (NPV) is USD 2.9 billion (12 % discount rate) over the evaluation period (2009 to 2028) as shown in Table 13.
Table 13

Economic indicator in NPV of switching driving side in 2009 price and 12 % discount rate (Million USD)

Vehicle Import

Vehicle Operating and Maintenance Cost

Vehicle Conversion Cost

Benefit at Border Crossings

Accident Cost

Road Furniture & Signage









4.8.2 Sensitivity analysis

One of the crucial determinants of economic viability of the switching option is estimation of relative costs and benefits between DN and DS scenarios. It is in this context, an attempt has been made to assess the extent of impact of variations in costs and benefits of DN option in relation to DS option for the economic viability of the switching driving side option (DS). To this end, the following sensitivity scenarios were considered on the basis of a preliminary sensitivity analysis:
  1. (A)

    15 % increase in the cost and 15 % decrease of benefit attributes of the DS option;

  2. (B)

    15 % decrease in the cost and 15 % increase of benefit attributes of the DN option;

  3. (C)

    (A) and (B) taken together;

  4. (D)

    20 % increase in the cost and 20 % decrease of benefit attributes of the DS;

  5. (E)

    20 % decrease in the cost and 20 % increase of benefit attributes of the DN option;

  6. (F)

    (D) and (E) taken together;


Results of the sensitivity analysis indicate that the DS option, i.e. switching driving side is economically viable satisfying almost all of the tests. However, in the case of the Test F when Test-D and Test-E were taken together, the Net Present Value (NPV) for the DS or switching driving becomes negative. It is therefore apparent that the economic viability of the DS or switching driving side option is very robust with considerably high variations of relative costs and benefits between of DN and DS options.

In addition, sensitivity analysis was carried out for pessimistic and optimistic vehicle growth scenarios as defined in Table 3. It appears from the analysis that although under pessimistic growth scenario, net benefits in term of NPV reduced by 55 %, overall benefit still remains positive, which is equivalent to USD 1.28 billion. Under optimistic growth scenario, the NPV increased up to 140 % indicating robustness of the economic viability of the DS or switching option in comparison to that of the business as usual or DN scenario.

4.9 Assessment of financial impacts of switching driving side

4.9.1 Impact on government revenue

Import duties

Since the import costs of RHD vehicles are between 17 and 49 % less than LHD vehicles, the Government will lose a substantial amount of revenue on vehicle imports, in the region of USD 88.99 million (16 % of the total import revenue under DN option during the evaluation period 2009 to 2028) under the DS option.

Fuel levies

Although some vehicle import revenues under DS scenario would be lost, this is far outweighed by additional net cash revenue the Government would earn of around USD 582.59 million from fuel levies, which is about 20 % higher than the total tax revenue from fuel levies under DN scenario due to a 16 % increase in the total number of vehicles under the DS option.

4.9.2 Overall financial impacts

The results of the financial analysis are shown in Table 14. Under DS scenario, the overall financial gains for Rwanda would be positive and net cash flow could be as high as USD 4.2 billion during the appraisal period, which about 50 % higher than that under DN scenario.
Table 14

Discounted (12 %) net cash flow projections for both dm and ds scenarios at 2009 price for the evaluation period (2009–2028)


DN (Million USD)

DS (Million USD)

NPV (Million USD)

% Difference

Government Revenue from vehicle import




−16.35 %

Government Revenue from fuel levy




19.51 %

Vehicle Importers’ Cost




18.35 %

Drivers and Operators’ Vehicle Operating Cost




33.13 %

Vehicle Conversion Cost




−24.39 %

Switching Operation, Road Furniture and Signage Cost





Damage only Accidents Costs




−164.02 %

Net Cash Flow




50.34 %

Impact on stakeholders

The overall net cash flow for stakeholders, including vehicle importers, users, private sector and Government; will be positive if the driving side is changed. The net cash flows accrued from vehicle import, operating and conversion costs will be positive, to the tune of around USD 264.60 million, USD 3,427.93, and 27.63 million respectively. The results of the financial analysis therefore demonstrate substantial financial gains for stakeholders including vehicle operators and users.

4.10 Stakeholder consultation

A comprehensive questionnaire/behavioural survey to solicit the perceptions and opinions of stakeholders regarding the potential impacts of switching driving side were undertaken. Under the bottom-up and participatory approach, five stakeholder consultation workshops were held to involve general citizens/stakeholders to participate in every step of the decision making process, starting from the project initiation, development of methodology, collection and analysis of data and validation of results. Although public opinion on switching driving side was mixed, a clear majority (54 %) still favoured switching from left to right, where 32 % were against and the remainder remaining were undecided or ambivalent as illustrated in Fig. 4. It appears that public perceptions and opinions coincide with the findings of the study.
Fig. 4

Distribution Public Opinion Regarding Switching Driving Side in Rwanda

5 Conclusions and recommendations

5.1 Conclusions

The key conclusions of the study are as follows:
  1. (i)

    Despite the fact that road infrastructure and transport regulations in Rwanda are designed for LHD vehicles, the study demonstrated that RHD vehicles have clear operational and financial advantages. This also explains the reasons for the dominance of RHD vehicles (99 %) prior to the imposition of import restriction on them in 2005;

  2. (ii)

    It appears that under a free market system without any regulatory control on importation of vehicles with respect to driving side, there will be overwhelming dominance of RHD vehicles in Rwanda;

  3. (iii)

    Due to reduction of vehicle import and operating costs, a free market system without any restriction on RHD vehicles would likely to promote relatively higher overall growth of vehicles in Rwanda;

  4. (iv)

    The perception of majority of drivers in Rwanda is that the incremental impacts on accident due to driving odd RHD vehicles are not very significant. This is analogous to the findings of the research around the world;

  5. (v)

    It appears that driving a RHD vehicle in a LHD traffic environment in Rwanda does not constitute a significant constraint;

  6. (vi)

    It is evident that switching driving from the right to the left side of the road would be highly beneficial from economical (NPV about USD 2.9 billion), financial (net cash flow USD 4.2 billion) and international trading points of view;

  7. (vii)

    As far as switching driving side is concerned, majority of the stakeholders support switching driving side in Rwanda. This is in line with the findings of the research; and

  8. (viii)

    The public participatory approach has been found to be a very useful tool in arriving at a logical conclusion on switching driving side in Rwanda.


5.2 Recommendations

Depending on decision to switch driving side from right to left, the following courses action could be undertaken:
  • Business as usual situation (DN scenario):
    1. i.

      Since odd HGVs are more susceptible to accidents, Rwanda must enact new regulation making it compulsory for the foreign HGVs to be fitted with Fresnel lens or close proximity (Class V) mirror to the passenger’s side widow to resolve the blind spot which can otherwise hinder HGV drivers’ vision of other traffic.

  • Switch driving side (DS scenario):

    If the decision were made to switch, efforts should be made to undertake adequate precautionary measures to smooth transition as follows:
    1. i.

      Any decision regarding switching driving side must be taken before the implementation of ongoing signage project;

    2. ii.

      It is essential to assign the responsibility of switching driving side to a high power body. It is therefore recommended to create a Steering Committee/Authority to administer the conversion of driving side;

    3. iii.

      It will be difficult to implement the switching driving side without appropriate policy guidance. Appropriate policy guidance on switching driving side must be prepared well in advance of actual implementation;

    4. iv.

      It is imperative to provide adequate transition time to ensure smooth transition between two operating systems. Transition time and operation modalities required for switching driving side must therefore be ascertained;

    5. v.

      As traffic signals in urban areas are very complex, sufficient transition time must be given to change existing traffic signals in these areas;

    6. vi.

      Due to non-availability of accident data with respect to driving side in Rwanda, it was not possible to assess the incremental impacts of odd vehicles on road accidents using primary data. Further study is needed to assess the incremental impacts of accidents due to presence of odd vehicles in the traffic stream and hence to adopt appropriate remedial measures; and

    7. vii.

      A comprehensive public awareness campaign must be undertaken to ensure wide publicity in all languages, for at least 1 month prior to the implementation of switching directives. In addition it would be valuable to circulate informative booklets directly to the public.




I acknowledge with gratitude the help and encouragement of the former Minister for Infrastructure, the Ministry of Infrastructure, Rwanda, Ms Linda Bihire. A research programme like this could not have been achieved without her constant support and invaluable guidance. I also express my indebtedness to Mr. Dominique Rurangirwa, Law Officer, the Ministry of Infrastructure for his interest in the work and making logistic supports available during collection of data for the research. Thanks are also due to Ms Kathleen DeWitt, Senior Transport Engineer, the Ministry of Infrastructure and all the members of my data collection team for their sincere efforts to make the research and the data collection initiative a success.

Finally, I gratefully acknowledge the help and patience of my wife and family.


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Copyright information

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Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  1. 1.Ministry of InfrastructureKigaliRwanda

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