Capacity Analysis of Priority Intersections with Flare under Mixed Traffic Conditions

Abstract

The gap-acceptance method is the common approach to assess the performance of the priority intersection which is implemented to regulate low volume of traffic flow. However, among the drawbacks of the gap-acceptance method are the non-compliance to the right of way, and the heterogeneous traffic condition. Conflict method has been developed to overcome these shortcomings. Surveillance equipment is used to obtain the required data, such as traffic volume and occupation time. The occupation time and approaching time of vehicle are used to calculate the capacity of vehicular movements for each conflict group. The results from intersections with flare and without flare are provided. Result comparison has also been made between the conflict method and the HCM 2000. 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.