00732377

Component

https://doi.org/10.3141/1555-01

http://scholar.google.com...nsky&publication_year=1996

Delay is the principal parameter used to measure the performance of signalized intersections. Average stopped delay is the primary measure of effectiveness used in evaluating level of service at signalized intersections in the U.S. "Highway Capacity Manual" (HCM). In an urban street network, the traffic performance at contiguous intersections is highly correlated. Typically, two upstream effects are present, signal coordination and signal metering. Therefore, the delay models developed for an isolated intersection with the assumption of random arrivals are no longer appropriate for delay estimation at a signalized arterial. The impact of signal coordination on delay has been well documented in the literature. However, the signal metering effect has yet to be thoroughly evaluated. For uncongested network flow conditions, the upstream metering effect is of less importance. However, for congested network flow conditions operating at or slightly below capacity, upstream metering becomes critical. In this study, an analytical overflow delay model that effectively incorporates the upstream metering effect for congested signalized networks is developed and the parameters are calibrated. The model is founded on a random queue model that assumes a generalized arrival distribution and a bulk service time distribution. The format of the overflow delay model developed in this work is consistent with the format of the current HCM model. The enhanced model, when effectively validated by field data, can be a good supplement of the current HCM model.

This paper appears in Transportation Research Record No. 1555, Highway Capacity Analysis for Interrupted and Uninterrupted Flow Facilities.

English

0000-0003-3439-7539

p. 1-8

1996

Transportation Research Record

0309059526

Figures (8) ; References (20) ; Tables (5)

Arterial highways; Estimating; Intersections; Overflows; Signalized intersections; Streets; Traffic congestion; Traffic delays; Traffic models

Highway Capacity Manual

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB

Feb 13 1997 12:00AM

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• ANALYSIS OF TRAFFIC OPERATIONS AT ALL-WAY STOP-CONTROLLED INTERSECTIONS BY SIMULATION
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