00605639

Component

http://onlinepubs.trb.org...trr/1990/1287/1287-005.pdf

https://scholar.google.co...tick&publication_year=1990

A new method for directly measuring total delay at isolated signalized intersections uses cumulative arrival and departure curves. This method of measuring total delay is an application of queueing theory that can be used for actuated and for pretimed signals. The data requirements of this method are greatly reduced by approximating the cumulative curves with piecewise linear curves and concentrating only on critical movements. As a result, a single observer can collect the data for all critical movements at an intersection, because only one critical movement occurs at a time. Plotting the data in the form of cumulative curves allows direct measurement of total delay, queue length, and percent of vehicles required to stop. The data collected for the delay measurement are used to simulate graphically the performance of a signalized intersection under different demand and control conditions. A set of cumulative arrival curves and a specified signal control strategy enable construction of cumulative departure curves for the critical movements. For actuated signals, the different critical movements must be simulated concurrently, because the timing for one movement influences the other movements. This graphical simulation method helps to visualize the flow behavior at an intersection and provides an alternative to computer simulation methods, which remove the user from the underlying processes.

This paper appears in Transportation Research Record No. 1287, Traffic Flow, Capacity, Roadway Lighting, and Urban Traffic Systems 1990. 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

01411069

p. 34-41

1990

Transportation Research Record

0309050626

Figures (9) ; References (5) ; Tables (1)

Distributions (Statistics); Isolated intersections; Measurement; Performance; Queuing theory; Signalized intersections; Stopped time delays; Traffic actuated controllers; Traffic delays

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Mar 31 1991 12:00AM

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