[01] Azad Abdulhafedh, Department of Civil Engineering, University of Missouri, Columbia, MO, USA.

Traffic signals at signalized intersections are effective tools to safely control the movement of traffic through the intersections word-wide. The conflicts arising from movements of traffic in different directions are addressed by time sharing between the intersection approaches. The advantages of traffic signals include an orderly movement of traffic, reduce probability of accidents by minimizing possible conflict points, and an increased capacity of the intersection, while stopping delays are the major disadvantage. This paper presents a prototype traffic signal design of four virtual fixed-time signalized intersections that addresses a coordinated design system. The major movements are assumed to occur along the Northbound and Southbound, and their optimal coordination through these intersections is achieved by changing their split times, cycle lengths, offsets, and left-turn phasing types in order to reduce the average delay, average number of stops, and travel time. Intersection 1, 3, and 4 are assumed to have the standard four-approaches, while intersection 2 is assumed to be a T-intersection with three-approaches. The simulation is conducted using VISSIM to make the final selections of the timing parameters.

Signal Design, Signalized Intersections, Cycle Length, Offsets, Splits

[01] ITE (Institute of Transportation Engineers), Brian Wolshon, and Anurag Pande. (2016). Traffic Engineering Handbook 7^th edition. Wiley and Sons, Inc. [02] Al-Kaisy. A. F., and Stewart. J. A. (2001). New approach for developing warrants of protected left-turn phase signalized intersections. Transportation Research part A. [03] Hong, S., Shin, E., Kim, D. N., and Kim, Y. (2003). An optimization model for signal timings and alternate lane use at a signalized intersection. Journal of the Eastern Asia Society for Transportation Studies. 1109-1123. [04] Koonce, P., Rodegerdts, L., Lee, K., Quayle, S., Beaird, S., Braud, C., Bonneson, J., Tarnoff, P., & Urbanik, T. (2008). Traffic Signal Timing Manual. Final Report FHWA-HOP-08-024, pp. 1-265. [05] Stamatiadis, N., Hedges, A., and Kirk, A. (2015) “A Simulation-Based Approach in Determining Permitted Left-Turn Capacities,” Transportation Research Part C. [06] Stevanovic, A., Stevanovic, J., & Kergaye, C. (2011). Optimizing Signal Timings to Improve Safety of Signalized Arterials. Submitted to the 3rd International Conference on Road Safety and Simulation, Indianapolis. [07] Wong, K. C. & Heydecker, G. B. (2011). Optimal Allocation of Turns to Lanes at an Isolated Signal Controlled Junction. Transportation Research Part B: 45, 667-681. [08] Yin, Y. (2008). Robust Optimal Traffic Signal Timing. Transportation Research Part B: 42, 911-924. [09] Xuan, Y., Daganzo, F. C., & Cassidy, J. M. (2011). Increasing the Capacity of Signalized Intersections with Separate Left Turn Phases. Transportation Research Part B: 45, 769-781. [10] Zhan, B. F., Chen, X. & Voigt, T. (2007). A Framework for Developing Left-Turn Operations Guidelines at Signalized Intersections. IEEE, 1-4244-0885-7/07, 1-6. [11] Gettman, D. & Head, L. (2003). Surrogate Safety Measures from Traffic Simulation Models. Report No. FHWA-RD-03-050, Federal Highway Administration, Washington, DC. [12] Yu, G. Z., Ren, Y. L. and Wang, Y. P. (2013). Hardware-in-the-loop simulation system of multi-intersection traffic signal control. Journal of Highway and Transportation Research and Development, 1: 110, 114-125. [13] Retting, R. A.; Chapline, J. F.; and Williams, A. F. (2002). Changes in Crash Risk Following Re-Timing of Traffic Signal Change Intervals. Accident Analysis and Prevention, 34: 215-20, 2002. [14] Kell, J. H. and Fullerton, I. J. (1991). Manual of Traffic Signal Design, Institute of Transportation Engineers, PrenticeHall, Inc., Englewood Cliffs, NJ. [15] Xie, X.-F.; Smith, S. F.; Lu, L.; and Barlow, G. J. (2012). Schedule-driven intersection control. Transportation Research Part C: Emerging Technologies. 24: 168–189. [16] Federal Highway Administration, FHWA. (2008). Traffic Signal Timing Manual. Report No. FHWA-HOP-08-024. Washington, DC: USDOT, FHWA, June 2008.