01099139

Component

https://doi.org/10.3141/2071-07

http://scholar.google.com...rage&publication_year=2008

Chapter 16 of the 2000 "Highway Capacity Manual" (HCM) contains a widely recognized and well-accepted procedure for calculating per-vehicle control delay at signalized intersections. Appendix F of that chapter discusses the relationship between various components of control delay using cumulative arrival and departure curves. The delay obtained from these curves has certain limitations that need to be recognized if proper conclusions are to be drawn. To illustrate these limitations, a comparison is made between the delay obtained from cumulative curves and the delay obtained through a detailed analysis of vehicle trajectories. A comparison of the control delay obtained from trajectory analysis and that obtained from cumulative arrival–departure curves shows that the cumulative curves omit certain valid portions of the control delay, while including other portions of time that are not delay at all. Taking a macroscopic approach to oversaturated delay estimation, the HCM procedures for dealing with oversaturated conditions are described and their shortcomings are explored using an example of a multiperiod analysis of an oversaturated approach to a signal. It is demonstrated that the current HCM equations can overestimate multiperiod delay and that the assumption of a capacity that is constant from cycle to cycle can underestimate delay at high values of the volume-to-capacity ratio.

01118256

English

pp 52-62

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309113465

Print

Figures (9) ; References (3)

Equations; Estimating; Signalized intersections; Traffic delays; Traffic oversaturation; Vehicle trajectories

Highway Capacity Manual 2000

Cumulative arrival and departure (Highway traffic)

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Jan 29 2008 3:38PM

• Analysis and Modeling of Automobile Users’ Perceptions of Quality of Service on Urban Streets
• Calibration Potential of Common Analytical and Microsimulation Roundabout Models: New England Case Study
• Capacity Reduction at Incidents: Empirical Data Collected from a Helicopter
• Control-Type Selection at Isolated Intersections Based on Control Delay Under Various Demand Levels
• Default Values for Highway Capacity and Level-of-Service Analyses
• Delay at Unsignalized Intersections
• Driver Behavior and Gap-Acceptance Characteristics at Roundabouts in California
• Estimating Capacity of U-Turns at Unsignalized Intersections: Conflicting Traffic Volume, Impedance Effects, and Left-Turn Lane Capacity
• Implementing Actuated Signal-Controlled Intersection Capacity Analysis with Pedestrians
• Inclement Weather Impacts on Freeway Traffic Stream Behavior
• Indicators of Performance on Two-Lane Rural Highways: Empirical Investigation
• Modeling Left-Turn Blockage and Capacity at Signalized Intersection with Short Left-Turn Bay
• Multimodal Level of Service for Urban Streets
• Testing Incremental Queue Accumulation Method Using Lankershim Boulevard NGSIM Data Set: A Replacement for HCM Signalized Intersection Uniform Delay and Queue Method in Los Angeles, California