00740624

Component

https://doi.org/10.3141/1572-14

http://scholar.google.com...hail&publication_year=1997

Average delay per vehicle is the primary measure for determining the level of service at signalized intersections. This performance measure is also a major component in the calculation of average travel speed used to determine the level of service on arterial streets. The most widely used models for estimating delay at signalized intersections are those in Chapters 9 ("Signalized Intersections") and 11 ("Urban and Suburban Arterials") of the "Highway Capacity Manual" (HCM). This research reviewed the literature on models for estimating delay at signalized intersections to identify limitations and formulate revised models to address those limitations. Specific problems that were addressed included the inability to account for actuated-control parameters, oversaturation and variable demand, and metering and filtering by upstream traffic signals. The research team developed a generalized delay model to address these limitations and then validated the generalized model with both field and simulation data. The proposed model is sensitive to actuated-control parameter settings, oversaturation and variable demand conditions, and filtering and metering effects of upstream signals. The proposed model is also a good predictor of delays observed in the field and estimated by microscopic traffic simulation programs for the conditions studied. The generalized delay model is recommended for inclusion in future editions of the HCM.

This paper appears in Transportation Research Record No. 1572, Highway Capacity Issues and Analysis.

English

p. 112-121

1997

Transportation Research Record

0309061504

Figures (8) ; References (17) ; Tables (3)

Arterial highways; Estimating; Field studies; Level of service; Problem solving; Signalized intersections; Traffic actuated controllers; Traffic delays; Traffic models; Traffic oversaturation; Traffic simulation; Validation

Highway Capacity Manual

Field data; Limitations; Variable demand

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Sep 5 1997 12:00AM

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• ASSESSMENT OF ROADWAY CAPACITY ESTIMATION METHODS
• CAPACITY OF ROUNDABOUTS IN JORDAN
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• OPERATIONAL PERFORMANCE MEASURES OF AMERICAN ROUNDABOUTS
• PERFORMANCE MEASURES IN "CANADIAN CAPACITY GUIDE FOR SIGNALIZED INTERSECTIONS"
• REVIEW AND EVALUATION OF METHODS FOR ANALYZING CAPACITY AT SIGNALIZED INTERSECTIONS
• SATURATION FLOWS AT SIGNAL-GROUP-CONTROLLED TRAFFIC SIGNALS
• TRAFFIC FLOW CHARACTERISTICS ON A THREE-LANE RURAL HIGHWAY IN FINLAND: RESULTS FROM EMPIRICAL STUDIES AND SIMULATIONS
• UNSIGNALIZED INTERSECTION ANALYSIS: EFFECT OF OVERLAPPING CONFLICTING TRAFFIC FLOW ON MINOR MOVEMENT POTENTIAL CAPACITY
• USING INPUT-OUTPUT DIAGRAM TO DETERMINE SPATIAL AND TEMPORAL EXTENTS OF A QUEUE UPSTREAM OF A BOTTLENECK
• UTILIZATION OF AUXILIARY THROUGH LANES AT SIGNALIZED INTERSECTIONS WITH DOWNSTREAM LANE REDUCTIONS
• VALIDATION OF GENERALIZED DELAY MODEL FOR OVERSATURATED CONDITIONS
• VALIDATION OF GENERALIZED DELAY MODEL FOR VEHICLE-ACTUATED TRAFFIC SIGNALS