01015535

Component

https://doi.org/10.3141/1920-11

http://scholar.google.com...+Kim&publication_year=2005

For oversaturated traffic conditions, the "Highway Capacity Manual" (HCM) does not apply a progression adjustment factor to the delay model for signalized intersections when there is an initial queue. This causes counterintuitive results in the calculation of delay; for some cases, delay for a nonzero initial queue condition ends up being less than the delay with zero initial queue conditions. Also, for oversaturated traffic conditions, the delay model in the 2000 edition of HCM yields the same uniform delay values for all arrival types when there is an initial queue. This does not seem reasonable because it ignores the effect of platooning on delay. This paper introduces a new approach for computing uniform delay for oversaturated traffic conditions when progression is poor. This approach directly considers the platooning effects in delay and thus eliminates the need to apply a progression adjustment factor. The proposed model is applicable whether there is an initial queue or not. The approach was validated by a comparison of the control delays obtained from a CORSIM simulation to the delays from the proposed model. Validation procedures were conducted on the basis of zero and nonzero initial queue conditions. The proposed approach resulted in more accurate delay values than the HCM model.

01015530

English

pp 86-94

2005

Transportation Research Record: Journal of the Transportation Research Board

0309093937

Print

Figures (6) ; References (10) ; Tables (3)

Accuracy; Adjustment factors; Signalized intersections; Traffic delays; Traffic models; Traffic oversaturation; Traffic platooning; Traffic simulation; Validation

CORSIM (Traffic simulation model); Highway Capacity Manual

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Jan 17 2006 2:28PM

• Calibrating and Validating Deterministic Traffic Models: Application to "Highway Capacity Manual" Control Delay at Signalized Intersections
• Capacity at Intersections Without Traffic Signals
• Comparison of Methods for Sensitivity and Uncertainty Analysis of Signalized Intersections Analyzed with the "Highway Capacity Manual"
• Driver Assessment of Service Quality on Urban Streets
• Effect of Lane Width on Speeds of Cars and Heavy Vehicles in Work Zones
• Effect of Pedestrian-Related Factors on Intersection Performance
• Effects of Parameter Distributions and Correlations on Uncertainty Analysis of "Highway Capacity Manual" Delay Model for Signalized Intersections
• Effects of U-Turns on Capacities of Signalized Intersections
• Headway Compression During Queue Discharge at Signalized Intersections
• Interchange Critical Movement Analysis for Planning and Preliminary Design Applications
• Methodology for Evaluating the Operational Performance of Interchange Ramp Terminals
• Modeling of Delay Induced by Downstream Traffic Disturbances at Signalized Intersections
• Variability of Peak Hour Factor at Intersections
• Video Simulation of Pedestrian Crossings at Signalized Intersections