Volume 04,Issue 02

Estimation and Comparison of the Discharge Headway at the Outlet and Inlet Legs of Signalized Intersection

Authors

Mohammad Reza Esmaeeli, Farid Najjari Asl, Milad Hassan Zadeh


Abstract

The time values of the saturation flow rate in signalized intersections play a key role in their schedule and performance. So far, many studies have been conducted to estimate the average discharge headway of the inlet legs of intersection, while, its values are not the same as the outlet legs due to the number of lines, driver behavior and other physical characteristics. In the present paper, with the help of the field data acquisition at five signalized intersections in Rasht city, the values of the discharge and delay time are estimated and compared in the inlet and outlet legs of the signalized intersection. The results show that the saturation conditions occur between the second and last vehicle in the outlet legs and between the fifth or sixth vehicle in inlet legs intersection. In other words, the number of vehicles with start-up delay is 1 or 2 vehicles and 4 or 5 vehicle in the outlet and inlet legs respectively. Also, the amount of saturation headway of outlet legs is less than the inlet legs.



Keyword: Signalized intersection, Startup delay, Inlet leg, Outlet leg, Average discharge headway.

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