The current methods for determining average stopped delay at signalized intersections were studied. Field measurements of average stopped delay were obtained and compared with values computed using both the 1985 and 1994 editions of the Highway Capacity Manual (HCM). The 1994 HCM uses an equation to predict the progression adjustment factor (PF), a new technique for determining the left-turn adjustment factor for saturation flow rates, and a new set of equations for determining the uniform delay parameter for left-turn lane groups with primary and secondary phasing. Overall, the 1994 HCM produces better estimates of intersection stopped delay than the 1985 HCM.
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References
1.
Special Report 209: Highway Capacity Manual, 3rd ed. TRB, National Research Council, Washington, D.C., Oct. 1994.
2.
Special Report 209: Highway Capacity Manual.TRB, National Research Council, Washington, D.C., 1985.
3.
A Technique for Measurement of Delay at Intersections: User's Manual, Vol. 3. Final Report FHWA-RD-76-137. FHWA, U.S. Department of Transportation, 1976.
4.
ChangE. C. P., FambroD. B., and MesserC. J.NCHRP Report 339: Effects of the Quality of Traffic Signal Progression on Delay.TRB, National Research Council, Washington, D.C., 1991.
5.
CourageK. G., WallaceC. E., and AlqasemR.Modeling the Effect of Traffic Signal Progression on Delay. In Transportation Research Record 1194, TRB, National Research Council, Washington, D.C., 1988, pp. 139–146.
6.
RouphailN. M.Delay Models for Mixed Platoon and Secondary Flows. Journal of Transportation Engineering, Vol. 114, No. 2, 1988, pp. 131–152.
