00467855

Component

http://onlinepubs.trb.org...trr/1987/1114/1114-006.pdf

https://scholar.google.co...hang&publication_year=1987

This paper contains the results of field studies conducted to evaluate four types of basic, full-traffic-actuated signal control systems operated at three diamond interchanges. Two signal phasing strategies were tested: (a) three-phase and (b) four-phase with two overlaps. Two small-loop (point) detection patterns--single- and multipoint--were evaluated for each type of phasing. An assessment of these systems was conducted based on the results of statistical and observational evidence regarding their operational effects on queues and cycle lengths. Multiple and geometric linear regression were used to formulate models that relate queuing delay to traffic characteristics. Single-point detection was found to be the more cost-effective three-phase design. Multipoint detection was found to be the more delay-effective four-phase configuration. Four-phase control characteristically operates at a longer cycle length than does three-phase for a given traffic volume, and this feature may produce higher average delays unless the cycle increase is controlled to the extent that the internal progression features of four-phase can overcome this deficiency.

Publication of this paper sponsored by Committee on Traffic Control Devices. 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

01418073

pp 54-62

1987

Transportation Research Record

0309044669

Print

Figures (9) ; References (6) ; Tables (1)

Actuated traffic signal controllers; Cost effectiveness; Diamond interchanges; Field studies; Linear regression analysis; Mathematical models; Queuing; Traffic actuated controllers; Traffic delays; Traffic signal cycle; Traffic signal phases

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Mar 31 1988 12:00AM

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