Identifying Benefits and Evaluating Traffic Parameters of Converting One-Way Streets to Two-Way Streets: A Case Study of Nazar Street in Isfahan, Iran

Document Type : Original Article

Authors
Ahmad Reza Jafarian Moghaddam 1
Nariman Nikoo 2
َAli Rostami 3
1 Assistant Professor, Department of Railway Engineering and Transportation Planning, Faculty of Civil Engineering & Transportation, University of Isfahan, Isfahan, Iran.
2 Assistant Professor, Department of Railway Engineering & and Transportation Planning, Faculty of Civil Engineering & Transportation, University of Isfahan, Isfahan, Iran.
3 M.Sc., Grad., Department of Railway Engineering & and Transportation Planning, Faculty of Civil Engineering & Transportation, University of Isfahan, Isfahan, Iran.
10.22034/road.2025.516654.2386
Abstract
The conversion of two-way streets to one-way systems is a traffic management strategy frequently implemented in narrow and congested urban areas. However, doubts have emerged regarding the overall effectiveness of this approach. This paper aims to investigate the potential benefits of converting one-way streets back to two-way operation through a review of existing literature. Furthermore, the traffic impacts of such conversions are analyzed using a simulation model. Key indicators related to environmental parameters, property value, economic vitality, on-street parking, travel time, distance traveled, level of service, safety and accidents, crime and security, and implementation cost were identified as influential factors in determining the advantages of this conversion. Nazar Street was selected as a case study, and three scenarios for its conversion to a two-way street were examined: converting the eastern section, the central section, and both the eastern and central sections. Simulation results indicated that converting the eastern section had the least negative impact on traffic parameters such as speed, delay, and travel time. Conversely, converting the central section to two-way operation was the least favorable option, leading to reduced speeds and increased delays. Across all scenarios, the network level of service remained unchanged. In addition to the traffic analysis, conducted through field observations, the social and economic benefits of these changes, such as improved local accessibility, enhanced pedestrian safety, and the strengthening of economic activities, were also considered. This study suggests that converting certain one-way streets to two-way operation, while potentially influencing some traffic parameters, can offer notable advantages.
Keywords
One-way Street
Two-way Street
Simulation
Before-and-after Study
Traffic Parameters
-رفیعی فروشانی، نرگس (1394). یکطرفه کردن خیابان­ها سیاستی در جهت کاهش ترافیک در منطقه­ی خاصی در شهر. مطالعه موردی: شهر اصفهان. پایان نامه کارشناسی ارشد، استاد راهنما: سید نادر شتاب بوشهری­، اصفهان: دانشکده دانشکده مهندسی صنایع و سیستم‌ها­، دانشگاه صنعتی اصفهان.
-کریمی، هادی، رفیعی فروشانی، نرگس، حسینی نسب، سید محمد رضا، و شتاب بوشهری، سید نادر (2019). یکطرفه کردن مجموعه‌ای از خیابان‌های شبکه حمل و نقل شهری با هدف کاهش ترافیک یک منطقه خاص. فصلنامه مهندسی حمل و نقل، 10(3)، 636-617.
-معمارمنتظرین، سروش، اکبرزاده، میثم، و سلیمانی، شیدا (2023). ارزیابی آسیب‌پذیری شبکه معابر شهری و شناسایی نقاط بحرانی، مطالعه موردی شبکه معابر شهری اصفهان. پژوهشنامه حمل و نقل، 20(2)، 378-369.
-مطالعات جامع حمل و نقل شهر اصفهان، معاونت حمل و نقل و ترافیک شهرداری اصفهان، (1394).
-Afandizadeh, Z. S., & Taromi, R. (2006). Selecting an Optimum Configuration of Urban One-Way and Two-Way Streets Using Genetic Algorithms. International Journal of Civil Engineerng, 4(3), 244-259.
-Baco, M. E. (2009). (2024) One-way to two-way street conversions as a preservation and downtown revitalization tool: The case study of Upper King Street, Charleston, South Carolina (Master’s thesis, Clemson University).
-Boeing, G., & Riggs, W. (2024). Converting one-way streets to two-way streets to improve transportation network efficiency and reduce vehicle distance traveled. Journal of Planning Education and Research, 44(3), 1670-1678.
-Chow, Y. H., Tan, Q. Y., Bhuiyan, M. A. S., Kumar, B. V. D., Reaz, M. B. I., Yuen, C. W., & Ooi, K. J. A. (2021, August). Urban Traffic Network Sustainability of One-Way and Two-Way Streets: A Case Study in Downtown Brickfields, Kuala Lumpur.
-Doig, J. C., Gayah, V. V., & Cassidy, M. J. (2013). Inhomogeneous flow patterns in undersaturated road networks: Implications for macroscopic fundamental diagram. Transportation Research Record, 2390(1), 68-75.
-Edwards, J. D. (2002). Converting one-way streets to two-way: managing traffic on main street. The National Trust's Main Street Center, Washington, DC.
-Ewing, R., & Dumbaugh, E. (2009). The built environment and traffic safety: a review of empirical evidence. Journal of Planning Literature, 23(4), 347-367.
-Johnson, B. (2020). Two-Ways to Revitalize Downtown: One-way to Two-way Street Conversion and its Potential Implications for Downtown Winnipeg’s South Portage Neighbourhood.
-Gayah, V. V. (2012). Two-way street networks: More efficient than previously thought?. Access Magazine, 1(41), 10-15.
-Gayah, V. V., & Daganzo, C. F. (2012). Analytical capacity comparison of one-way and two-way signalized street networks. Transportation Research Record, 2301(1), 76-85.
-Murphy, C. J. (1950). Baltimore's one-way streets. Traffic Quarterly, 4(3).
-Papaioannou, P. (2007). Driver behaviour, dilemma zone and safety effects at urban signalised intersections in Greece. Accident Analysis & Prevention, 39(1), 147-158.
-Riggs, W., & Gilderbloom, J. (2016). Two-way street conversion: Evidence of increased livability in Louisville. Journal of Planning Education and Research, 36(1), 105-118.
Riggs, W., & Appleyard, B. (2018). The economic impact of one to two-way street conversions: advancing a context-sensitive framework. Journal of Urbanism, International Research on Placemaking and Urban Sustainability, 11(2), 129-148.
-Roess, R. P., Prassas, E. S., & McShane, W. R. (2004). Traffic engineering Pearson/Prentice Hall, 1-99.
-Stemley, J. J. (1998). One-way streets provide superior safety and convenience. ITE Journal, 68(8), 47-50.
-Sun, F., Wang, D. H., & Ma, D. F. (2012). Evaluating the Reconversion of One-Way Street Pairs to Two-Way Operations in the Central Business District of Hangzhou. In CICTP 2012, Multimodal Transportation Systems—Convenient, Safe, Cost-Effective, Efficient, 599-610.
-Walker, G. W., Kulash, W. M., & McHugh, B. T. (2000). Downtown Streets: Are We Strangling Ourselves in One-Way Networks? (No. E-C019,).