DESIGN OF A TRAFFIC SIGNALISATION SCHEME AT OLA-OLU INTERSECTION, ILORIN, NIGERIA
DOI:
https://doi.org/10.11113/mjce.v32.16189Keywords:
Urban intersection, Congestion, Traffic signals, Crashes, SafetyAbstract
Ola-Olu intersection in Ilorin metropolis, Nigeria, is a 3-legged intersection in a typical urban centre of a developing economy. It is presently traffic warden controlled at morning peak period on weekdays and occasionally in the evening when there’s an event in a neighbouring public event centre that is expected to increase the traffic at the intersection. It is observed that the delay experienced at the intersection is quite high and traffic crashes at the intersection is a weekly occurrence. The study thereby aims at ameliorating the hazards by designing a fixed-time traffic signalization for the intersection. The objectives are to i. determine the geometric layout of the intersection ii. determine the traffic volume and vehicular turning movement pattern and iii. design and provide the signal timings at the T-intersection. Traffic volume survey and geometric layout survey were carried out at the intersection and analyzed to determine the optimum cycle length and signal setting using the Webster’s method. A 3-phase fixed time traffic signalization of 155 seconds cycle length was designed for an effective signal traffic control. The green time for phases 1, 2 and 3 are 102 seconds, 16 seconds and 22 seconds respectively. The implementation of the traffic signal will enhance both traffic flow and safety at the intersection.
References
Reddy, B. S., Reddy, N. V. H. 2016. Signal Design for T-intersection by using Webster's Method in Nandyal Town, Kurnool District of Andhra Pradesh. International Research Journal of Engineering and Technology. 3(04): 1124-1131.
Worldometers 2020. Nigerian Population. Retrieved from https://www.worldometers.info/world-population/nigeria-population/ Accessed on: May 20, 2020
Adeleke, O. O. 2010. Empirical Modelling of Delays at Traffic Warden Controlled Urban Intersections: Case Study of Ilorin, Nigeria. Department of Civil Engineering, University of Ilorin, Ilorin, Nigeria. Unpublished PhD Thesis.
Wang, C. 2016. Analysis and Visualization of Traffic Signal Performances. University of Tampere. Retrieved from https://tampub.uta.fi/bitstream/handle/10024/99535/GRADU-1470208656.pdf?sequence=1 Accessed on: February 3, 2019
Zegeer, C. V., Lagerwey, P., Cynecki, M., Ronkin, M. and Schneider, R. 2002. Pedestrian Facilities Users Guide: Providing Safety and Mobility (pp. 162): Diane Publishing.
Mathew, T. 2014. Design Principles of Traffic Signals. Transportation Systems Engineering. 34: 13.
Patil, S. 2015. A Methodology for Resourceful Design of Traffic Signal Control. International Journal of Multidisciplinary Research and Development, 2(3): 133-137.
Manual on Uniform Traffic Control Devices (2009). Manual on Uniform Traffic Control Devices; for Streets and Highways: US Department of Transportation, Federal Highway Administration.
North Star Highways 2019. Warrants and Justifications for Traffic Signals. Retrieved from https://northstarhighways.wordpress.com/2016/10/04/warrants-and-justifications-for-traffic-signals/ Accessed on: February 6, 2019
Federal Ministry of Works 2013. Highway Manual: Geometric Design I(I): 216 Federal Republic of Nigeria
Sanganaikar, R. S., Leekha, V., Khan, R., Hussain, A. 2018. Design of Traffic Signal at Kundahallli Junction, Bengaluru Karnataka. 9(6): 1688-1696.
Federal Highway Administration 2013. Chapter 5. Traffic Signal Design and Illumination. Signalized Intersections: An Informational Guide. Retrieved from https://safety.fhwa.dot.gov/intersection/conventional/signalized/fhwasa13027/ch5.pdf Accessed on: February 17, 2019
Environment 1996. Traffic Signs Manual. https:// trafficsigns.ie/wp-content/uploads/2015/12/9-Traffic-Signals.pdf Accessed on: February 25, 2019
Federal Highway Administration 2017. Traffic Signal Timing Manual. United State Department of Transportation. Retrieved from https://ops.fhwa.dot.gov/publications/fhwahop08024/chapter4.htm Accesssed on: February 6th. 2019
Koonce, P., Lee, K., Quayle, S., Beaird, S., Braud, C., Bonneson, J., Tarnoff, P., Urbanik, T. 2008. Basic Signal Timing Procedure and Controller Parameters. Traffic Signal Timing Manual . 265.
Maki, P. J. 1999. Adverse Weather Traffic Signal Timing. Paper presented at the Transportation Frontiers for the Next Millennium: 69th Annual Meeting of the Institute of Transportation EngineersInstitute of Transportation Engineers (ITE).
Transport Research Board 2000. Highway Capacity Manual, Transport Reseach Board, USA
Jimoh, Y. A., Adeleke, O. O., Afolabi, A. A. 2012. An Evaluation of the operation of a Fixed–Time Signalization Scheme for a Four Leg Intersection in Ilorin Metropolis, Nigeria. Research Journal of Applied Sciences, Engineering and Technology, 4(17): 2839-2845.
Federal Highway Administration 2008. Traffic Signal Timing Manual. US Department of Transportation. Retrieved from https://nacto.org/docs/usdg/signal_timing_manual_fhwa.pdf Accessed on: May 15, 2020
Zakariya, A. Y., Rabia, S. I. 2016. Estimating the Minimum Delay Optimal Cycle Length Based on a Time-dependent Delay Formula. Alexandria Engineering Journal, 55(3): 2509-2514.
Palmer, G. R. 2009. Traffic Control Signal Design Manual. Revision 3. https://www.ct.gov/dot/lib/dot/documents/dtrafficdesign/sigmanapproved2009.pdf Accessed on: February 5, 2019
Roess, R. P., Prassas, E. S., McShane, W. R. 2004. Traffic Engineering: Pearson/Prentice Hall.