00732378

Component

https://doi.org/10.3141/1555-02

http://scholar.google.com...hail&publication_year=1996

The primary objective of this research was to determine the effect of nonrandom or platoon arrivals on the estimate of delay at signalized intersections. The delay model used in the 1994 "Highway Capacity Manual" (HCM) accounts for nonrandom arrivals through the variable m, which can be shown to be equal to 8kI, where k describes the arrival and service distributions at the intersection and I describes the variation in arrivals due to the upstream intersection. The 1994 HCM delay model m-values are a function of the arrival type, where the arrival type describes the quality of progression at the intersection. Although an improvement to the fixed kI-value used in the 1985 delay model, the 1994 m-values are based on empirical studies from limited field data and do not account for the decrease in random arrivals as the volume approaches capacity at the downstream intersection. This research provides an estimate of the variable kI for arterial conditions. An analytical equation was developed as a function of the degree of saturation, and a separate equation was developed for each signal controller type. The results from this research show that the proposed kI's provide delay estimates closer to the measured delay compared with the delay estimates using the kI-values in the 1994 HCM delay model.

This paper appears in Transportation Research Record No. 1555, Highway Capacity Analysis for Interrupted and Uninterrupted Flow Facilities.

English

p. 9-16

1996

Transportation Research Record

0309059526

Figures (3) ; References (16) ; Tables (4)

Arterial highways; Equations; Estimating; Intersections; Percent saturation; Signalized intersections; Streets; Traffic delays; Traffic models; Traffic signal controllers

Highway Capacity Manual

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB

Feb 13 1997 12:00AM

• ANALYSIS OF TRAFFIC OPERATIONS AT ALL-WAY STOP-CONTROLLED INTERSECTIONS BY SIMULATION
• ASSESSING HEAVY VEHICLE IMPACTS ON OPERATION OF RURAL AT-GRADE INTERSECTIONS IN BRAZIL
• CAPACITY AT UNSIGNALIZED TWO-STAGE PRIORITY INTERSECTIONS
• COMPARISON OF PLANNING AND OPERATIONAL ANALYSIS PROCEDURES FOR SIGNALIZED INTERSECTIONS FROM THE "HIGHWAY CAPACITY MANUAL"
• ESTIMATING INTERSECTION APPROACH DELAY USING 1985 AND 1994 "HIGHWAY CAPACITY MANUAL" PROCEDURES
• EVALUATING WEAVING SECTION DESIGNS USING INTEGRATION
• ONE-SIDED WEAVING OPERATIONS ON ONE-WAY FRONTAGE ROADS
• OVERFLOW DELAY MODEL FOR SIGNALIZED ARTERIALS
• PHASE TIME PREDICTION FOR TRAFFIC-ACTUATED INTERSECTIONS
• PROGRESSION FACTOR FOR QUEUE LENGTH AND OTHER QUEUE-RELATED STATISTICS
• SATURATION FLOW AND CAPACITY OF SHARED LANES: COMPARATIVE EVALUATION OF ESTIMATION METHODS
• STOCHASTIC MODELING OF SHARED-LANE LEFT-TURN PROCESS AND ITS EFFECT ON SATURATION FLOW
• TRUCK PERFORMANCE ON ARGENTINEAN HIGHWAYS
• VARIABILITY OF SPEED-FLOW RELATIONSHIPS ON GERMAN AUTOBAHNS