TECHNICAL PAPERS
Dec 1, 1989

Accuracy of Turning Flow Estimates at Road Junctions

Publication: Journal of Transportation Engineering
Volume 115, Issue 4

Abstract

Several methods for obtaining turning probabilities have been suggested to help in estimating turning flows. One of these methods is based on historical data of approach counts available for each intersection. The turning proportions are then estimated for each individual intersection rather than using average values according to intersection type. This paper investigates the accuracy of turning flow estimates using this technique when applied to intersections in Kuwait. The turning flow estimates are compared with the observed, flows. The variations of the magnitude of the errors in estimates with the magnitude of the estimated flows are thoroughly investigated, and the implications of these variations are discussed. The results show that reasonable estimates were obtained at some intersections, but locations where the network has undergone major changes showed higher errors.

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References

1.
Hauer, E., Pagitsas, E., and Shin, B. T. (1981). “Estimation of turning flows from automatic counts.” Trans. Res. Record 795, Transportation Research Board, Washington, D.C., 1–7.
2.
Jadaan, K. S., and Said, G. M. (1984). “Characteristics of traffic on Kuwait ring roads.” Aust. Road Res., 14(2), 87–92.
3.
Jeffreys, M., and Norman, M. (1977). “On finding realistic flows at road junctions.” Traff. Engrg. Control, 18(1), 19–21, 25.
4.
Marshall, M. L. (1979). “Labour saving methods for accounting traffic movements at three‐ and 4‐arm junctions.” Traff. Engrg. Control, 20(4), 159–162.
5.
Mekky, A. (1979). “On estimating turning flows at road junctions.” Traff. Engrg. Control, 20(10), 486–487.
6.
Mountain, L. J., and Westwell, P. M. (1983). “The accuracy of estimation of turning flows from automatic counts.” Traff. Engrg. Control, 4(1), 3–7.
7.
Van Zuylen, H. J. (1979). “The estimation of turning flows on a junction.” Traff. Engrg. Control, 20(11), 539–541.

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Go to Journal of Transportation Engineering
Journal of Transportation Engineering
Volume 115Issue 4December 1989
Pages: 438 - 449

History

Published online: Dec 1, 1989
Published in print: Dec 1989

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Authors

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Khair S. Jadaan, Member, ASCE
Assoc. Prof., Dept. of Civ. Engrg., Kuwait Univ., Kuwait 13060

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