00378818

Component

http://onlinepubs.trb.org...s/trr/1983/905/905-008.pdf

https://scholar.google.co...ddes&publication_year=1983

The calculation of delay and stops by the TRANSYT program and in turn the effectiveness of the signal timings resulting from its optimization procedure depend on the ability of its platoon dispersion model to accurately predict traffic flow patterns from one signal to another. Therefore, calibration of the dispersion factor alpha and travel-time factor beta in the model is important to the successful implementation of the TRANSYT program. However, because of limited research, a definitive description of the relationship between the appropriate values of alpha and beta and roadway conditions does not exist. The objective of this research was to contribute to the ultimate development of a definitive description of this relationship by calibrating this model for passenger cars under low-friction traffic flow conditions. Platoon dispersion studies were conducted on six arterial street segments (2 two-way two-lane segments and 4 four-lane divided segments). Traffic flow patterns of nearly 1700 platoons were analyzed. The results indicated that less platoon dispersion was observed in this study than has been found in other studies of low-friction traffic flow conditions. It was concluded that appropriate values of alpha and beta for passenger cars under these conditions are alpha equal to 0.21 and beta equal to 0.97 on two-way two-lane streets and alpha equal to 0.15 and beta equal to 0.97 on four-lane divided streets. (Author)

Publication of this paper sponsored by Committee on Traffic Flow Theory and Characteristics. 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

00386621

HS-036 185

pp 48-52

1983

Transportation Research Record

62nd Annual Meeting of the Transportation Research Board

Print

Figures (1) ; References (8) ; Tables (5)

Arterial highways; Automobiles; Calibration; Divided highways; Four lane highways; Optimization; Traffic delays; Traffic flow; Traffic platooning; Traffic signal timing; Traffic simulation; Travel time; Two lane highways

Two way traffic

Highways; Operations and Traffic Management; I71: Traffic Theory

HSL, TRIS, TRB

Dec 30 1984 12:00AM

• ANALYSIS OF EXISTING FORMULAS FOR DELAY, OVERFLOW, AND STOPS
• ANALYSIS OF TRANSYT PLATOON-DISPERSION ALGORITHM
• ANOTHER LOOK AT BANDWIDTH MAXIMIZATION
• APPLICATION OF COUNTING DISTRIBUTION FOR HIGH-VARIANCE URBAN TRAFFIC COUNTS
• CANDIDATE ACCIDENT SURROGATES FOR HIGHWAY SAFETY ANALYSIS
• COMMON BIAS IN BEFORE-AND-AFTER ACCIDENT COMPARISONS AND ITS ELIMINATION
• COMPARATIVE ANALYSIS OF SIGNALIZED-INTERSECTION CAPACITY METHODS
• COMPARISON OF SOAP AND NETSIM: PRETIMED AND ACTUATED SIGNAL CONTROLS
• DELAY MODELS OF TRAFFIC-ACTUATED SIGNAL CONTROLS (DISCUSSION AND CLOSURE)
• DERIVATION OF EQUATIONS FOR QUEUE LENGTH, STOPS, AND DELAY FOR FIXED-TIME TRAFFIC SIGNALS
• DETERMINING CAPACITY AND SELECTING APPROPRIATE TYPE OF CONTROL AT ONE-LANE TWO-WAY CONSTRUCTION SITES
• DEVELOPMENTAL STUDY OF IMPLEMENTATION GUIDELINES FOR LEFT-TURN TREATMENTS
• EFFECTIVENESS EVALUATION BY USING NONACCIDENT MEASURES OF EFFECTIVENESS (ABRIDGMENT)
• EVALUATING NEED FOR ACCIDENT-REDUCTION EXPERIMENTS
• EVALUATION OF DYNAMIC FREEWAY FLOW MODEL BY USING FIELD DATA (DISCUSSION AND CLOSURE)
• MINIMIZING COST OF MANUAL TRAFFIC COUNTS: CANADIAN EXAMPLE
• OPTIMIZATION MODEL FOR ISOLATED SIGNALIZED TRAFFIC INTERSECTIONS
• PASSENGER-CAR EQUIVALENTS FOR RURAL HIGHWAYS (DISCUSSION)
• RELIABILITY OF CLASSIFIED TRAFFIC COUNT DATA
• SINGLE-LANE CAPACITY OF URBAN FREEWAY DURING RECONSTRUCTION (ABRIDGMENT)
• SKELETON PROCEDURE FOR EVALUATION OF HIGHWAY SAFETY IMPROVEMENTS ON A ROAD NETWORK
• SPEEDS AND FLOWS ON AN URBAN FREEWAY: SOME MEASUREMENTS AND A HYPOTHESIS
• SURROGATE MEASURES FOR ACCIDENT EXPERIENCE AT RURAL ISOLATED HORIZONTAL CURVES
• TANDEM TOLL BOOTHS FOR THE GOLDEN GATE BRIDGE
• TANDEM TOLL COLLECTION SYSTEMS (ABRIDGMENT)
• TRAFFIC DATA-COLLECTION SYSTEMS: CURRENT PROBLEMS AND FUTURE PROMISE (ABRIDGMENT)