00621694

Component

http://onlinepubs.trb.org...trr/1991/1320/1320-019.pdf

https://scholar.google.co...ehey&publication_year=1991

This paper examines the 1985 Highway Capacity Manual (HCM) definition of critical gap for two-way stop-controlled (TWSC) intersections. Minor street left-turning movements at unsignalized three-leg intersections are examined. On the basis of this examination, a revision is recommended for the HCM definition, which better reflects actual driver behavior and provides a better estimate of the capacity of TWSC intersections. The effects of front-of-queue delay on the length of the critical gap were investigated. On the basis of a limited amount of field data, the critical gap was found to be significantly affected by the amount of front-of-queue delay incurred by individual drivers. It is therefore recommended that any delay-based level of service (LOS) criterion for TWSC intersections should incorporate lower delay thresholds than are used for signalized intersections at least in the LOS D, E, and F regions. Finally, the collected field data demonstrate that the critical gap for minor street left-turning vehicles is affected by the type of major street conflict (same direction versus opposite direction) experienced. From this finding, it is concluded that the distribution of major street traffic can have a substantial effect on the capacity of the minor street left-turn movement.

This paper appears in Transportation Research Record No. 1320, Freeway Operations, Highway Capacity, and Traffic Flow 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407170

p. 154-159

1991

Transportation Research Record

0309051533

Figures (9) ; References (6)

Arterial highways; Definitions; Field studies; Gap acceptance; Left turns; Level of service; Stop signs; Streets; Three leg intersections; Traffic delays; Traffic distribution; Traffic queuing; Unsignalized intersections

Highway Capacity Manual

Critical gap; Field data; Two-way stop control

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Apr 30 1992 12:00AM

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