00378816

Component

http://onlinepubs.trb.org...s/trr/1983/905/905-006.pdf

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

Traffic-actuated signal controls have more control variables for engineers to deal with than a pretimed control. The increased sophistication in their control logic provides greater flexibilities in signal control but also makes the evaluation of their performance more difficult. At the heart of the problem is that traffic delays cannot be readily related to the control variables of a traffic-actuated control. This prompts practicing engineers to rely mostly on short-term, subjective field observations for evaluation purposes. To provide an improved capability for evaluating alternative timing settings, delay models are developed in this study for semiactuated and full-actuated controls that employ motion detectors and sequential phasing. These models are based on a modified version of Webster's formula. The modifications include the use of average cycle length, average green-duration, and two coefficients of sensitivity that reflect the degree of sensitivity of delay to a given combination of traffic and control conditions. Average cycle length and average green duration are dependent on the settings of the control variables and the flow pattern at an intersection. They can be estimated by existing methods. (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-036 183

Courage, Kenneth G

pp 33-38

1983

Transportation Research Record

62nd Annual Meeting of the Transportation Research Board

Print

Figures (7) ; References (8)

Actuated traffic signal controllers; Coefficients; Green interval (Traffic signal cycle); Length; Measures of effectiveness; Sensitivity; Traffic actuated controllers; Traffic delays; Traffic flow; Traffic signal cycle; Traffic simulation

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
• CALIBRATION OF TRANSYT PLATOON DISPERSION MODEL FOR PASSENGER CARS UNDER LOW-FRICTION TRAFFIC FLOW CONDITIONS (ABRIDGMENT)
• 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
• 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)