00638681

Component

http://onlinepubs.trb.org...trr/1993/1398/1398-012.pdf

https://scholar.google.co...elik&publication_year=1993

Some initial formulations of general overflow delay formulas that can be applied to isolated intersection approaches as well as those contained in a signalized arterial network are discussed. The main issues addressed are the deficiencies in models of arrival that have been developed to account for the filtering effect of upstream signals, which use the Poisson arrival process as their foundation. A cycle-by-cycle simulation model is the investigation tool. This level of modeling allows for the estimation of the uniform and overflow delay components separately. The results of the model are first tested for the isolated intersection scenario. The simulation model results are then extended to a two-intersection system, and a generalized delay model is calibrated to encompass both the isolated and the system cases. The initial work is limited, however, to fixed-time signal control with no platoon dispersion and no secondary or midblock flows between the two approaches. Only single-lane flow cases are considered. It was found from the simulation results that the inclusion of a parameter X sub o (a value of the degree of saturation below which the overflow delay is negligible) in the delay model is justified. The study also confirmed that progression quality has no effect on the overflow delay estimate. Two competing overflow delay model forms were investigated; one used the variance-to-mean ratio of upstream departures and the other used the capacity differential between intersections to reflect the filtering effect. Whereas the first form has been widely quoted and advocated in the literature, the second approach provided better predictions in this study.

This paper appears in Transportation Research Record No. 1398, Traffic Flow and Highway Capacity. 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

01403239

English

p. 82-89

1993

Transportation Research Record

0309054672

Figures (9) ; References (21) ; Tables (1)

Deficiencies; Pretimed traffic signal controllers; Traffic signals; Traffic simulation

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Oct 26 1993 12:00AM

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