QUEUES AND DELAYS AT SIGNALIZED INTERSECTIONS, INDONESIAN EXPERIENCE

To predict queues and delays at signalized intersections in Indonesia, the 1997 Indonesian Highway
Capacity Manual (IHCM) has been widely used. However, the queue length at signalized
intersection predicted by IHCM was usually over value. The aim of this research is, therefore, to
improve the IHCM formula to calculate the queue length at signalized intersection.

Traffic surveys have been carried out at various signalized intersections in some Indonesian cities.
The measured queues have been compared to the IHCM predicted queues. IHCM formula has been
calibrated by trial and error method in such a way that there was no significant different between
the predicted and the measured queues.

A new improved saturation flow formula has been recommended to be used for calculating the
queue length and delay. It has also been recommended to reduce the passenger car equivalent for
motorcycle.
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