Commenced in January 2007
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Paper Count: 30174
Travel Time Evaluation of an Innovative U-Turn Facility on Urban Arterial Roadways

Authors: Ali Pirdavani, Tom Brijs, Tom Bellemans, Geert Wets, Koen Vanhoof

Abstract:

Signalized intersections on high-volume arterials are often congested during peak hours, causing a decrease in through movement efficiency on the arterial. Much of the vehicle delay incurred at conventional intersections is caused by high left-turn demand. Unconventional intersection designs attempt to reduce intersection delay and travel time by rerouting left-turns away from the main intersection and replacing it with right-turn followed by Uturn. The proposed new type of U-turn intersection is geometrically designed with a raised island which provides a protected U-turn movement. In this study several scenarios based on different distances between U-turn and main intersection, traffic volume of major/minor approaches and percentage of left-turn volumes were simulated by use of AIMSUN, a type of traffic microsimulation software. Subsequently some models are proposed in order to compute travel time of each movement. Eventually by correlating these equations to some in-field collected data of some implemented U-turn facilities, the reliability of the proposed models are approved. With these models it would be possible to calculate travel time of each movement under any kind of geometric and traffic condition. By comparing travel time of a conventional signalized intersection with U-turn intersection travel time, it would be possible to decide on converting signalized intersections into this new kind of U-turn facility or not. However comparison of travel time is not part of the scope of this research. In this paper only travel time of this innovative U-turn facility would be predicted. According to some before and after study about the traffic performance of some executed U-turn facilities, it is found that commonly, this new type of U-turn facility produces lower travel time. Thus, evaluation of using this type of unconventional intersection should be seriously considered.

Keywords: Innovative U-turn facility, Microsimulation, Traveltime, Unconventional intersection design.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1078144

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References:


[1] Liu, P., Lu, J.J., Fan, J., Pernia, J. and Sokolow, G. "Effects of U-turns on the Capacities of Signalized Intersections", Transportation Research Record 1920, TRB, National Research Council, Washington D.C., 2005, pp. 74-80.
[2] Liu, P., Pan, T., Lu, J.J. and Cao, B. "Effects of U-turns on the Capacities of Unsignalized Intersections", Proceeding of 87th Annual Meeting of the Transportation Research Board, January 13-17 2008.
[3] Carter, D., Hummer, J.E., Foyle, R.S., "Operational and Safety Effects of U-turns at Signalized Intersections" Transportation Research Record: Journal of the Transportation Research Board, No. 1912, 2005, pp. 11- 18.
[4] Liu, P., Lu, J. Hu, F. and Sokolow, G., "Capacity of U-turn Movement at Median Openings on Multilane Highways", Journal of Transportation Engineering, Vol. 134, No. 4, 2008, pp. 147-154.
[5] Liu, P., Lu, J. Wang, X. and Sokolow, G., "Headway Acceptance Characteristics of U-turning Vehicles on 4-lane Divided Roadways.", Transportation Research Record: Journal of the Transportation Research Board No. 2027, 2007, pp. 52-57.
[6] Liu, P., Lu, J., Sokolow, G., and Zhou, H., "Operational Effects of Uturns as Alternatives to Direct Left-turns", ASCE Journal of Transportation Engineering. Vol. 133, No. 5, 2007, pp. 327-334.
[7] Guo, T., Liu, P., Lu, L., Cao, B., "A Procedure for Evaluating the Impacts of Indirect Driveway Left-turn Treatments on Traffic Operations at Signalized Intersections", Proceeding of 88th Annual Meeting of the Transportation Research Board, January 11-15 2009.
[8] Tabernero, V., and Sayed, T., "Upstream Signalized Crossover Intersection: An Unconventional Intersection Scheme." Journal of Transportation Engineering, ASCE, Vol. 132(11), 2006, pp. 907-911.
[9] Sayed, T., Storer, P., and Wong, G., "Upstream Signalized Crossover Intersection: Optimization and Performance Issues.". Transportation Research Record, Journal of the Transportation Research Board, National Research Council, Washington D.C., Vol. 1961, 2006, pp. 44- 54.
[10] El Esawey M., and Sayed, T., "Comparison of Two Unconventional Intersection Schemes: Crossover Displaced Left-Turn and Upstream Signalized Crossover", Transportation Research Record, Journal of the Transportation Research Board, National Research Council, Washington D.C., Vol. 2023, 2007, pp. 10-19.
[11] Stover, V. G., "Issues Relating to Weaving on At-Grade Roadways and the Right-Turn Followed by U-turn Maneuver", Florida Department of Transportation, Center for Urban Transportation Research, University of South Florida, Tampa, 1994.
[12] Gluck, J., H. S. Levinson, and Stover, V. G. "NCHRP Report 420: Impacts of Access Management Techniques", TRB, National Research Council, Washington, D.C., 1999.
[13] Long, G., and Helms, J., "Median Design for Six-Lane Urban Roadways", Transportation Research Center, University of Florida, Gainesville, Oct. 1991.
[14] Al-Masaeid, H. R. "Capacity of U-Turn at Median Opening", ITE Journal, Vol. 69, No. 6, 1999, pp. 28-34.
[15] Hummer, J. E. "Unconventional Left-Turn Alternatives for Urban and Suburban Arterials", Part 1, ITE Journal, Vol. 68, No. 9, 1998, pp. 26- 29.
[16] Reid, J., and Hummer, J., "Analyzing System Travel Time in Arterial Corridors with Unconventional Designs Using Microscopic Simulation." Transportation Research Record, Journal of the Transportation Research Board, National Research Council, Washington D.C., Vol. 1678, 1999, pp. 208-215.
[17] Reid, J., and Hummer, J., "Travel Time Comparisons between Seven Unconventional Arterial Intersection Designs.". Transportation Research Record, Journal of the Transportation Research Board, National Research Council, Washington D.C., Vol. 1751, 2001, pp. 56-66.
[18] Jagannathan, R., and Bared, J., "Design and Operational Performance of Crossover Displaced Left-Turn (XDL) Intersections", Transportation Research Record, Journal of the Transportation Research Board, National Research Council, Washington D.C., Vol. 1881, 2004, pp. 1- 10.
[19] Kim, T., Edara, P. K., Bared, J., "Operational and Safety Performance of a Non-Traditional Intersection Design: The Superstreet", Proceeding of 86th Annual Meeting of the Transportation Research Board, 21-25 January 2007.
[20] Highway Capacity Manual, Transportation Research Board, National Research Council,
[21] Washington D.C., 2000.
[22] A Policy on Geometric Design of Highways and Streets, American Association of State Highway and Transportation Officials (AASHTO), Washington D.C., 2001.