Capacity of U-Turn Movement at Median Openings on Multilane Highways
Publication: Journal of Transportation Engineering
Volume 134, Issue 4
Abstract
The goal of this study is to develop a procedure for estimating the capacity of U-turn movement at median openings on multilane highways. Data were collected at six selected median openings in the Tampa Bay area of Florida. The critical gap for U turns was estimated by using the maximum likelihood method. The follow-up time for U turns was determined by using a linear regression model developed in this study. With the estimated critical gaps and follow-up times, Harders model was used to estimate the capacity of U-turn movement. It was found that the median width at median openings greatly impacts the capacity of U-turn movement. Vehicles making U turns at median openings with wide medians (median nose width ) have larger potential capacity than those making U turns at median openings with narrow medians (median nose width ). The results of Harders model were tested against the capacity data measured in the field using Kyte’s method. It was found that Harders model provided reasonable capacity estimate for U-turn movement at median openings.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This research was partially sponsored by the Florida Department of Transportation. The assistance provided by FDOT is greatly appreciated.
References
Adams, J. C., and Hummer, J. E. (1993). “Effects of U-turns on left-turn saturation flow rates.” Transportation Research Record. 1398, Transportation Research Board, Washington, D.C., 90–100.
Al-Masaeid, H. R. (1999). “Capacity of U-turn at median opening.” ITE J., 69(6), 28–34.
Brilon, W., Koenig, R., and Troubeck, R. J. (1999). “Useful estimation procedures for critical gaps.” Transp. Res., Part A: Policy Pract., 33, 161–186.
Carter, D., Hummer, J. E., and Foyle, R. S. (2005). “Operational and safety effects of U-turns at signalized intersections.” Transportation Research Record. 1912, Transportation Research Board, Washington, D.C., 11–18.
Harders, J. (1968). “The capacity of unsignalized urban intersections.” Schriftenreihe Strassenbau Strassenverkehrstechnik, 76.
Kyte, M., Clemow, C., Mahfood, N., Lall, B. K., and Khisty, C. J. (1992). “Capacity and delay characteristics of two-way stop-controlled intersections.” Transportation Research Record. 1920, Transportation Research Board, National Research Council, Washington, D.C.
Kyte, M., Tian, Z., Mir, Z., Hameedmansoor, Z., Kittelson, W., Vandehey, M., Robinson, B., Brilon, W., Bondzio, L., Wu, N., and Troutbeck, R. J. (1996). “Capacity and level of service at median openings.” NCHRP Rep. No. 346, National Cooperative Highway Research Program, Transportation Research Board, Washington, D.C.
Liu, P., Lu, J. J., Fan, J., Pernia, J., and Sokolow, G. (2005). “Effects of U-turns on the capacities of signalized intersections.” Transportation Research Record. 1920, Transportation Research Board, National Research Council, Washington, D.C., 74–80.
Miller, A. J., and Pretty, R. L. (1968). “Overtaking on two-lane rural roads.” Proc., 4th ARRB Conf., Washington, D.C.
Transportation Research Board (TRB). (2000). Highway capacity manual, National Council, Washington, D.C.
Tsao, S. and Chu S. (1996). “A study on adjustment factors for U-turns in left-turn lanes at signalized intersections.” J. Advanced Transportation, 29(2), 183–192.
Wu, N. (1999). “Capacity of shared-short lanes at unsignalised intersections.” Transp. Res., Part A: Policy Pract., 33, 255–274.
Information & Authors
Information
Published In
Copyright
© 2008 ASCE.
History
Received: Apr 10, 2006
Accepted: Sep 20, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.