01366399

Component

Conflict method is regarded as the viable solution for the drawbacks in the gap-acceptance approach. It has been used for the capacity analysis of unsignalized intersection, which includes the two-way stop-controlled, and the all-way stop-controlled types. This method is now applied for the capacity estimation of vehicular movements at non-priority intersection, where gap-forcing, poor lane discipline, violation of priority rule, and heterogeneous traffic co-exist. The concepts developed for capacity estimation have considered the blocking effect from all possible conflicting streams. The probability of non-blocking traffic movements and the portion of consumed shared capacity by the subject stream are analyzed. The proposed concepts generated high capacity values, even though the observed intersections have near-saturation traffic. Small vehicles with high percentage occupy the lateral lane space, which are permitted by gap-forcing and poor lane discipline, besides their smaller footprint. There are some issues encountered when applying the conflict method for non-priority intersection analysis, particularly with the occupation time and PCU values. Thus, further modifications to the conflict method, including the usage of arrival time interval to replace the occupation time, and PCU based on the occupied area by vehicle are suggested.

This paper was sponsored by TRB committee AHB40 Highway Capacity and Quality of Service

01362476

12-3050

English

15p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References; Tables

Gap acceptance; Highway capacity; Traffic conflicts; Traffic oversaturation; Unsignalized intersections; Vehicle mix

Data and Information Technology; Highways; Operations and Traffic Management; I71: Traffic Theory; I73: Traffic Control

Transportation Research Board Annual Meeting 2012 Paper #12-3050

TRIS, TRB

Feb 8 2012 5:13PM