Variable Speed Limits: Strategies to Improve Safety and Traffic Parameters for a Bottleneck
The primary purpose of the speed limit system is to enforce reasonable and safe speed. To reduce secondary problems such as accidents and queuing, Variable Speed Limits (VSL) has been suggested. In this paper VSL is used to better safety and traffic parameters. Traffic parameters including speed, queue length and stopping time have been pondering. For VLS, an optimization decision tree algorithm with the function of microscopic simulation was used. The results in case of sub saturated, saturated and supersaturated at a bottleneck are examined and compared with the Allaby logic tree. The results show that the proposed decision tree shows an improved performance in terms of safety and comfort along the highway. The VSL pilot project is part of the Road Safety Improvement Program included in Iran’s road safety action plan that is in the research process in the BHRC Research Institute, Road and Housing & Urban Development Research that is planned for next 10-year Transportation safety view Plan.
World Health Organization, Global Status Report on Road Safety 2013: Supporting a Decade of Action, Geneva, Switzerland, 2013.
T. Bliss, B. Jeanne, Road Safety Management Capacity Reviews and Safe System Projects Guidelines, Working Paper 84203, Washington, DC, World Bank Group, 2013
Federal Highway Administration, Impacts of Technology Advancements on Transportation Management Center Operations Final Report, FHWA-HOP-13-008, 2013
Austroads Research Report, Best Practice for Variable Speed Limits: Literature Review, Austroads, Sydney, 2009
C. Lee, B. F. Hellinga, F. Saccomanno, “Assessing safety benefits of variable speed limits”, Transportation Research Record 1897, TRB, National Research Council, Washington, D.C, Vol. 1, No. 1, pp. 183-190, 2004
M. Abdel-Aty, J. Dilmore, A. Dhindsa, “Evaluation of variable speed limits for real-time freeway safety improvement”, Accident Analysis & Prevention,Vol. 38, No. 2, pp. 335-345, 2006
P. Allaby, B. Hellinga, M. Bullock, “Variable Speed Limits: Safety and Operational Impacts of a Candidate Control Strategy for Freeway Applications”, IEEE Transactions on Intelligent Transportation Systems, Vol. 8, No. 4, pp. 671-680, 2007
R. Carlson, I. Papamichail, M. Papageorgiou, A. Messmer, “Variable Speed Limits as a Mainline Metering Device for Freeways”, Transportation Research Board Annual Meeting, Washington, DC, Paper #10-1529, 2010
M. Abdel-Aty, R. Cunningham, V. Gayah, L. Hsia, “Dynamic Variable Speed Limit Strategies for Real-Time Crash Risk Reduction on Freeways”, Transportation Research Record No. 2078, Transportation Research Board of the National Academies, Washington, DC, Vol. 1, No. 1, pp. 108-116, 2008
FHWA-SA-12-022, “Guidelines for the use of variable speed limit systems in wet weather”, US Department of Tranportation, 2012
F. Rahmani, F. Ghahari , Weka Software Guide, 2010
PDF Downloads 77
Authors who publish with this journal agree to the following terms:
- Authors retain the copyright and grant the journal the right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after its publication in ETASR with an acknowledgement of its initial publication in this journal.