00647272

Component

http://onlinepubs.trb.org...trr/1993/1421/1421-012.pdf

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

An enhanced delay estimation model for the popular traffic signal optimization model PASSER II-90 is described. Although the results from this model focus on enhancements to PASSER II-90, the findings presented should be useful to the future formulation of the "Highway Capacity Manual" (HCM) methodology for arterial streets. Development of the enhanced delay model primarily involved a four-step arrival rate model instead of the current two-step arrival rate model. Total delay was calculated on the basis of whether the traffic arrivals were early or late. Specifically, delay was estimated using the length and the time of arrival of the traffic platoon at the downstream intersection. TRANSYT-7F was used to investigate the effectiveness of the current PASSER II model and the enhanced PASSER II model. The enhanced PASSER II delay model resulted in large reductions in deviations of the delay values from TRANSYT-7F. Delay-offset trends in enhanced PASSER II-90 now closely follow the TRANSYT-7F delay-offset curves. Delays were also observed to closely follow the NETSIM curves in some regions. It was also observed that in the optimization mode, there was no significant difference in the calculated delay values between the old and the new estimation models. The new delay estimation model in PASSER II-90 also demonstrated that the platoon dispersion modeling in PASSER II compares favorably with TRANSYT's platoon dispersion factor of 0.30 to 0.35. Conclusively, the new model in PASSER II-90 has substantially improved delay estimation over all possible offsets for through traffic.

This paper appears in Transportation Research Record No. 1421, Traffic Control Devices, Visibility, and Traffic Signal Systems. 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

01398730

English

p. 94-103

1993

Transportation Research Record

0309055741

Figures (8) ; References (11) ; Tables (1)

Arterial highways; Estimating; Estimation theory; Offsets (Traffic signal timing); Streets; Traffic delays; Traffic platooning

Highway Capacity Manual; PASSER (Computer program); PASSER II (Computer program); TRANSYT (Computer program)

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB

May 2 1994 12:00AM

• ANALYSIS OF FLASHING SIGNAL OPERATION
• DECISION SUPPORT SYSTEM FOR CONTROLLING TRAFFIC SIGNALS
• DEVELOPMENT OF AN EMERGENCY ZONE SIGN
• ENTRANCE ANGLE REQUIREMENTS FOR RETROREFLECTORIZED TRAFFIC SIGNS
• EVALUATION OF THE FEDERAL VISION STANDARD FOR COMMERCIAL MOTOR VEHICLE OPERATORS
• EXACT ROAD GEOMETRY OUTPUT PROGRAM FOR RETROREFLECTIVE ROAD SIGN PERFORMANCE
• HYBRID GENETIC ALGORITHM TO OPTIMIZE SIGNAL PHASING AND TIMING
• METHODOLOGY FOR EVALUATING TRAFFIC DETECTOR DESIGNS
• MICROSCOPIC SIMULATION MODELING OF MINIMUM THRESHOLDS WARRANTING INTERSECTION SIGNALIZATION
• OPERATIONAL COMPARISON OF LEADING AND LAGGING LEFT TURNS
• PASSER IV: A PROGRAM FOR OPTIMIZING SIGNAL TIMING IN GRID NETWORKS (WITH DISCUSSION AND CLOSURE)
• SELECTION CRITERIA FOR LEFT-TURN PHASING AND INDICATION SEQUENCE