Evaluation of unsignalized intersection based on the occupation time of vehicle
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Date
2011-05-01
Authors
Halimshah Ahmad
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Abstract
An intersection provides link between different vehicle movements. It requires traffic
control to minimize the traffic conflicts that are caused by these vehicle movements.
The unsignalized intersection is implemented to regulate low volume of traffic flow.
It consists of two-way stop-controlled (TWSC) and all-way stop-controlled (AWSC).
There are various methods to analyze the unsignalized intersection. The gapacceptance method is the comon approach to assess the performance of the
intersection. This evaluation depends on the drivers’ perception during gap selection.
Among the drawbacks of the gap-acceptance method are the non-compliance to the
right of way, and the heterogeneous traffic condition. It has led to the development of
the conflict method. This approach is based on the occupation time of vehicles at
conflict areas in the intersection. In this study, data collection is conducted with the
assistance of surveillance camera. The occupation time of vehicle is used to calculate the movement capacity. The capacity of each vehicle movement is determined according to conflict groups. The control delay and level of service of the vehicle movements is then evaluated according to the procedures in HCM 2000. Result comparison is made between the conflict method and the HCM 2000 approach. The relationship between the occupation time and critical gap is discovered. The results of the conflict method are found to be comparable with the HCM 2000 using field data.