01336884

Component

https://doi.org/10.3141/2257-04

http://scholar.google.com...iele&publication_year=2011

The Highway Capacity Manual (HCM) is one of the most widely used transportation documents in the world. The signalized intersections methodology, one of the most frequently used portions of the manual, is used to estimate capacity and average control delay for individual lane groups and for intersections as a whole. The method does not estimate control delay for vehicles permitted to turn right on red, nor does it include these vehicles in the computation of capacity. It is recognized that vehicles making right turns on red (RTORs) increase intersection capacity. Thus, capacity, delay, and level of service may not be predicted accurately when RTORs occur. For the specific case in which a shared through and right-turn lane exists and RTORs are permitted, models were developed to estimate the number of RTORs that can be expected and the additional capacity that is realized. The models are deterministic and are consistent with the HCM methodology, are easily understood by analysts, produce reasonable results, and account for the probabilistic nature of RTORs occurring from shared lane approaches. The capacity model also demonstrates that, where RTORs are permitted and do occur, the HCM method results in an underestimation of capacity and an overestimation of delay for approaches containing shared lanes.

01363031

11-0807

English

pp 31-39

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309222938

Print

Figures (2) ; References (7) ; Tables (2)

Highway capacity; Level of service; Right turn on red; Signalized intersections; Traffic delays; Traffic estimation; Traffic models; Traffic volume

Highway Capacity Manual

Shared-use lanes

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Feb 17 2011 5:35PM

• Automobile-Oriented or Complete Street? Pedestrian and Bicycle Level of Service in the New Multimodal Paradigm
• Capacity of Multilane All-Way Stop-Controlled Intersections Based on the Conflict Technique
• Control Delay Calculation at Diverging Diamond Interchanges
• Cycle-by-Cycle Queue Length Estimation for Signalized Intersections Using Sampled Trajectory Data
• Decision Tree–Based Model for Estimation of Work Zone Capacity
• Developing Capacity Models for Local Roundabouts: Streamlined Process
• Development of Managed-Lane Access Guidelines Based on Gap Acceptance Theory
• Effect of Driver Cell Phone Use on Queue Discharge Patterns at Signalized Intersections
• Evaluating the Impacts of Unconventional Outside Left-Turn Lane Design on Traffic Operations at Signalized Intersections
• Impact of Inclement Weather on Left-Turn Gap Acceptance Behavior of Drivers
• Modeling Delay During Heavy Traffic for Signalized Intersections with Short Left-Turn Bays
• Running Time Prediction for Signalized Urban Streets
• Speed–Flow Curves for Freeways in Highway Capacity Manual 2010