Determination of Basic Saturation Flow Rate in Istanbul

Year 2018, Volume: 4 Issue: 1, 47 - 52, 01.03.2018

Süleyman Dündar Kemal Selçuk Öğüt

Abstract

In traffic signal operations, the saturation
flow rate is one of the key parameter for the calculation of signal timing. The
saturation flow rate for different type of roads is simply calculated by
multipliying the basic saturation flow rate, which is determined for predefined
road type and flow condition with side factors. The aim of this study is to
calculate the basic saturation flow rate in Istanbul. This calculation is based
on the evaluation of vehicles’ headways at signalized intersection. The field study is conducted at 23
signalized intersections having basic conditions and 18,311 vehicle headways
are analyzed. The initial calculations in this study are the determination of the
saturation flow region, in other word from which vehicle in the queue does the
saturation flow start. It is found that the saturated headway starts from
second to eighth vehicle while the saturated headway is determined as 1.9
seconds, which is equivalent to 1,894 passenger cars unit per hour as
saturation flow rate.

Keywords

Signalized intersection, Saturated headway, Saturation flow rate, Basic saturation flow rate

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