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Feasibility and Operational Analysis of Unconventional Intersection Designs in Dense Urban Areas

Mohammad Hasan Naser(1), Ibrahim Hashim Khliefat(2*)

(1) The University of Jordan, Jordan
(2) Al-Balqa Applied University, Jordan
(*) Corresponding author



The increasing populations in major urban areas and the complexities associated with living in those communities have fuelled the increasing demands for mobility in most of the major metropolitan areas. This high demand coupled with the limited resources and restrictions on the available right of way in urban areas has motivated transportation engineers in different agencies around the world to test and apply unconventional solutions in an attempt to improve the level of service on the major roadway network. This paper combines both theoretical and real-life operational performance comparison for the before and the after of the construction of unconventional designs on two major intersections in the city of Riyadh, KSA. It provides the results of VISSIM micro-simulation model calibration and the performance analysis for the case study intersections. In addition, it presents the comparison of the existing conditions following the actual construction of the unconventional intersection designs and it and provides a feasibility analysis for a double continuous flow intersection that was used in the study. The results have showed an improved intersection performance from the simulation models and the actual data collected for the case study intersections. In addition, they have showed that it has been feasible to apply those designs in urban areas.
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Unconventional Intersection Design; Synchronized Split Phase Intersection; Double Continuous Flow Intersection; Micro-Simulation; VISSIM

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Hassouna, F., Performance Analysis of Modern Roundabouts as an Alternative to Conventional Signalized Intersections: a Comprehensive Review, (2020) International Review of Civil Engineering (IRECE), 11 (5), pp. 229-235.

Ahmad Reshad Aziz, Monicaba Vala, Mayank Kanani, Review on Analysis and Design of Intersection, IJARIIE, Vol. 4 - Issue 1, 2018.

Ourabah, L., El Kari, B., Labriji, E., Fuzzy Graph-Based Controller for a Real-Time Urban Traffic Optimization, (2020) International Review on Modelling and Simulations (IREMOS), 13 (5), pp. 354-361.

Rui Yue, Guangchuan Yang, Yichen Zheng, Jianqing Wu, Dongmei Lin, Zong Tian, Feasibility of using a single traffic signal controller to accommodate adjacent intersections, International Journal of Transportation Science and Technology, Vol. 9 - Issue 1, P.P 52-63, 2020.

Peirong (Slade) Wang, Pengfei (Taylor) Li, Farzana R. Chowdhury, Li Zhang, Xuesong Zhou, A mixed integer programming formulation and scalable solution algorithms for traffic control coordination across multiple intersections based on vehicle space-time trajectories, Transportation Research Part B: Methodological, Elsevier, vol. 134(C), pages 266-304, 2020.

Diego H. Carroll, Derek Lahusen. Operational Effects of Continuous Flow Intersection Geometrics A Deterministic Model. Transportation Research Record: Journal of the Transportation Research Board, Vol. 2348, PP. 1-11, 2013

Krasniqi, R., Doci, I., Shala, A., Berisha, R., Regulation of Traffic Flow in Small Cities with High Number of Vehicles: Case of Malisheva City - Kosovo, (2018) International Review of Civil Engineering (IRECE), 9 (4), pp. 161-167.

Alternative Intersections/Interchanges Informational Report (AIIR) (FHWA-HRT-09-060, April 2010).

Ibrahim Khliefat, Ahmad Deeb, Mohammad Mubarak and Mohammad Naser, The Effect of Modifying Double Continuous Flow Intersections Layout Geometric Features on their Operation, 2021, The Open Transportation Journal, 15 (1-10)

An Applied Technology and Traffic Analysis Program-Unconventional Arterial Intersection Design. (Maryland State Highway Administration, 2004)

Reuben Goldblatt, Francisco Mier, Joel Friedman. Continuous Flow Intersections. ITE Journal, PP. 35-42, July 1994

Xing Gao, Jing Zhao, Meng Wang, Modelling the Saturation Flow Rate for Continuous Flow Intersections Based on Field Collected Data, PLoS ONE 15(8): e0236922, 2020.

You X, Li L, Ma W. Coordinated Optimization Model for Signal Timings of Full Continuous Flow Intersections. Transportation Research Record. 2013;2366(1):23-33.

Miao YuWei (David) Fan, Calibration of microscopic traffic simulation models using metaheuristic algorithms, International Journal of Transportation Science and Technology, Vol. 6 (Issue 1): 63-77, June 2017.

Xiaoming You, Li Li and Wanjimg ma, Coordinated optimization model for signal timings of continuous flow intersections, Research Board, Vol. 2356, PP. 23-33, 2013.

Yang, X., Y. Lu, and G.-L. Chang. An Integrated Computer System for Analysis, Selection, and Evaluation of Unconventional Intersections, (Final report. State Highway Administration, Baltimore, Md., 2011)

Chlewicki, G. New Interchange and Intersection Designs: The Synchronized Split-Phasing Intersection and the Diverging Diamond Interchange. 2nd Urban Street Symposium, pp. 3-16, Anaheim, CA, 2003.

Park, S., and H. Rakha. Continuous Flow Intersections: A Safety and Environmental Perspective. 13th Annual International IEEE Conference on Intelligent Transportation Systems, Madeira Island, Portugal, 2010

Xiangchen, The symmetric intersection design and traffic control optimization, Transportation Research Part C: Emerging Technologies, Vol. 92, P.P 176-190, 2018.

Al-Omari, Abdel-Aty, Evaluation of a New Intersection Design "Shifting Movements", TRB 100th annual meeting, Washington DC, 2021.

Coates A, Ping Y, Koganti S, Du Y, Maximizing intersection capacity through unconventional geometric design of two-phase intersections. Transportation Research Record: Journal of the Transportation Research Board, Vol. 2309, pp. 30-38, 2012.

El Esawey, M., and T. A. Sayed. Comparison of Two Unconventional Intersection Schemes: Crossover Displaced Left-Turn and Upstream Signalized Crossover Intersections. Transportation Research Record: Journal of the Transportation Research Board, Issue 2023, pp. 10-19, 2007.

Sun, Qiao, Safety Performance of Displaced Left Turn Intersections Case Studies in San Marcos, Texas, ProQuest Dissertations Publishing, 2019.

Sherif Shokry, Shinji Tanaka, Fumihiko Nakamura, Ryo Ariyoshi, Shino Miura, Operational Performance Comparison between Conventional Intersections and Two Unconventional Alternative Intersection Designs (UAIDs) Under Heterogeneous Traffic Conditions in Cairo, Egypt, Transportation Research Procedia, Vol. 48, P.P 923-938, 2020.

Xiaoning Wang; Li Song; Peijie Wu; and Siyuan Yu, Analysis of Unconventional Design for Signalized and Closely-Spaced T-Intersections proceedings of the 19th COTA International Conference of Transportation Professionals, July 6-8, 2019

Jagannathan, R. and Bared, J.G. Design and Operational Performance of Crossover Displaced Left-Turn Intersections. Transportation Research Record: Journal of the Transportation Research Board, Vol. 1881, 1-10, 2004.

Angela Coates, Ping Yi, Peng Liu, and Xinlu Ma. Geometric and Operational Improvements at Continuous Flow Intersections to Enhance Pedestrian Safety, Transportation Research Record: Journal of the Transportation Research Board, Vol. 2436, (issue 1): 60-69, 2014

Statistical Year Book (General Authority for Statistics - KSA, , 52nd Issue, Riyadh KSA, 2016)

Sudarsana, D., Sanjaya, P., Development of Delay Claim with a Traffic Volume Approach of the Road National Improvement Project, (2019) International Review of Civil Engineering (IRECE), 10 (3), pp. 142-147.


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