Abstract
Capacity plays an important role while planning and designing of any roadway. The features of geometric of a roadway like the grade and curve radius will govern the capacity of a roadway. Passenger car unit (PCU) is used to estimate the capacity of the roadway. The passenger car unit values of a vehicle type alter concerning to speed. The speed of the vehicle is governed by geometric features of a roadway. This work objective is to learn the effect of geometric of the roadway such as grade, curve, and straight sections on PCU values of heterogeneous traffic conditions on a two-way four-lane national highway. Geometric and traffic data collected at 7 sections on NH-16. PCU value’s estimation of the vehicle types of mixed traffic is difficult as compared with the homogeneous traffic conditions. PCU values are estimated by using speed–area ratio (dynamic PCU) method. Dynamic PCU (speed–area ratio) approach considers the vehicle average speed. The outputs had revealed that the capacity of the roadway declines as the percentage of downgrade increases. With an increase in the percentage of upgrade, the capacity of the road increases. The capacity of the roadway increased at the quick curve in contrast with mild curve and straight roads.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Arkatkar SS (2011) Effect of intercity road geometry on capacity under heterogeneous traffic conditions using microscopic simulation technique. Int J Earth Sci Eng SPL 04(06):375–380 ISSN 0974-5904
Arkatkar S, Arasan VT (2010) Effect of gradient and its length on performance of vehicles under heterogeneous traffic conditions. J Transp Eng 136(12):1120–1136
Chandra S (2004) Capacity estimation procedure for two-lane roads under mixed traffic conditions. Ind R Con J 165:139-169
Chandra S, Goyal NK (2001) Effect of grade on capacity of two-lane road. HB No. 64, IRC, New Delhi, pp 77
Chandra S, Kumar U (2003) Effect of lane width on capacity under mixed traffic conditions in India. J Trans Eng 129(2):155–160
Chandra S, Sikdar PK (2000) Factors affecting PCU in mixed traffic on urban roads. Road Trans Res 9(3):40–50
HCM (2010) Highway Capacity Manual. Transportation research board. National Research Council, Washington, D.C.
Metkar M, Budhkar AK, Maurya AK (2012) A review of passenger car equivalence for Indian conditions. Int J Comput Appl. https://www.researchgate.net/publication/235801441
Shalkamy A, Said D, Radwan L (2015) Influence of carriageway width and horizontal curve radius on passenger car unit values of two-lane two-way rural roads. Civil Env Res 7(3)
Srikanth S, Mehar A (2017) Estimation of equivalency units for vehicle types under mixed traffic conditions: multiple non-linear regression approach. Int J Technol 820–829
Yagar S, Aerde MV (1983) Geometric and environmental effects on speeds of two-lane highways. Transp Res Part A 315–325
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Sai Kumar, N., Naidu, V.M., Prasad, C.S.R.K. (2020). Estimation of Equivalency Units of Vehicle Types for Road Geometry. In: Arkatkar, S., Velmurugan, S., Verma, A. (eds) Recent Advances in Traffic Engineering. Lecture Notes in Civil Engineering, vol 69. Springer, Singapore. https://doi.org/10.1007/978-981-15-3742-4_3
Download citation
DOI: https://doi.org/10.1007/978-981-15-3742-4_3
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-15-3741-7
Online ISBN: 978-981-15-3742-4
eBook Packages: EngineeringEngineering (R0)