Limited priority merge at unsignalized intersections

Limited priority merge at unsignalized intersections

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Article ID: iaor19993017
Country: United Kingdom
Volume: 33A
Issue: 3/4
Start Page Number: 291
End Page Number: 304
Publication Date: Apr 1999
Journal: Transportation Research. Part A, Policy and Practice
Authors: ,
Keywords: measurement
Abstract:

The development of a new gap acceptance model based on limited priority for the major stream is discussed. Field observations were carried out to identify the mechanism of the merging process taking place at unsignalized intersections under congested conditions. It was found that the major stream headways were increased due to the merging vehicles, particularly at high flows. A limited priority system is proposed based on the assumption that the major stream vehicles would be slightly delayed to accommodate the minor stream vehicles. Equations for capacity in the limited priority system are presented assuming the major stream vehicles to have a bunched exponential headway distribution and the minor stream drivers to be both consistent and homogeneous. The gap acceptance model based on the limited priority was then applied to the performance of roundabouts. It was found that the limited priority merge can have a significant effect on the entry capacity at two-lane roundabouts. A near linear relationship between the entry capacity and the circulating stream flow at two-lane roundabouts was identified which was similar to the empirical results from the UK.

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