The main objective of this study is to evaluate the effectiveness of using active traffic management (ATM) strategies on freeways in terms of the driver’s behavior and operational impacts. A few test beds were selected to evaluate the impacts of ATM such as speed harmonization, shoulder utilization, and ramp metering. Test beds used in this study were at places where an ATM is either proposed or previously implemented, i.e., where data exists for conditions prior to and after the implementation of ATM. Data collected from the test beds were used in a simulation model to evaluate the impacts of each ATM strategy on speed, travel time, and crash rates. Simulation results indicated that the implementation of speed harmonization on US 90 showed a 14% reduction in crashes and a 2%–3% increase in freeway speed; the implementation of hard shoulders on US 90 showed a 39% increase in travel time, 22% increase in freeway capacity and 60% decrease in delays; and the implementation of ramp metering on US 59 between Bissonnet St. and Fondern road showed a decrease of 23 % in freeway travel time, a 14% increase in freeway speed and 11% decrease in accident rates.
Federal Highway Administration, Active traffic management: the next step in congestion management, Washington D.C.: Office of International Programs, 2007.
M. Robinson, Examples of variable speed limit applications, In: the Speed Management Workshop, 79th Annual Meeting of the Transportation Research Board, Washington D.C., 2000.
B. Park, S. Yadlapati, Development and testing of variable speed limit logics at work zones using simulation, In: Transportation Research Board 82nd Annual Meeting, Washington D.C., 2003.
G. Riegelhuth, A. Pilz, Temporary hard shoulder use in Hessen: experiences and strategic planning, Technical Session 3.3: ERP achievements and results in traffic management, Aalborg: Pilz Traffic Centre Hessen, 2007.
S. Cohen, Using the hard shoulder and narrowing lanes to reduce congestion: some lessons from an experience on the Paris motorway network, In: Proceedings of the 12th IEE Conference on Road Transport Information and Control, London, 2004.
F. Middleham, State of practice in dynamic traffic management in the Netherlands, Rotterdam: Transport Research Centre, 2005.
R. Usath, Ramp metering: new experiences in NRW, http://www2.napier.ac.uk/euramp/workshop_proc/EURCAMP_workshop_usath.pdf, 11-11-2011.
G. Piotrowicz, J. Robinson, Ramp metering status in North America, Washington D.C.: U.S. Department of Transportation, 1995.
S.T. Waller., M.W. Ng, E. Ferguson, et al., Speed harmonization and peak-period shoulder use to manage urban freeway congestion, The University of Texas at Austin: Center for Transportation Research, 2009.
About this article
Cite this article
Vadde, R., Sun, D., Sai, J.O. et al. A simulation study of using active traffic management strategies on congested freeways. J. Mod. Transport. 20, 178–184 (2012). https://doi.org/10.1007/BF03325796
- active traffic management
- speed harmonization
- hard shoulder
- ramp metering