01154447

Component

https://doi.org/10.3141/2173-10

http://scholar.google.com...+Yin&publication_year=2010

While the "Highway Capacity Manual" (HCM) 2000 does provide a separate procedure to estimate the back of queue for a lane group, its signalized intersection analysis procedure does not explicitly account for the impact to through movement traffic as a result of left-turn bay spillover. If the HCM methodology is used for an analysis of an intersection approach where left-turn spillover interferes with the discharge of through vehicles, the estimated delay results, and corresponding level of service, will be overly optimistic. Thus, the objective of this study was to determine the factors that significantly affect left-turn lane spillover and develop a model, or models, to predict the expected through movement capacity and discharge rate as a function of this spillover. Two approaches were used in this study: an analytical approach that developed a probability of left-turn spillover equation to incorporate into a capacity estimation equation, and an empirical approach incorporating the use of microsimulation to develop equations to estimate through movement discharge as a function of left-turn spillover. The developed probabilistic model was an enhancement to one from the literature. However, its accuracy of estimation was still limited due to the issue of intercycle queue-formation dependencies not being taken into account. The two models developed from regression analysis of simulation data—one for intersection approaches with only a single through lane and one for intersection approaches with multiple through lanes—replicate the simulation results quite reasonably.

01323680

10-2794

English

pp 80-88

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160438

Print

Figures (4) ; References (10) ; Tables (5)

Highway capacity; Highway operations; Left turns; Level of service; Microsimulation; Regression analysis; Signalized intersections; Through traffic; Traffic delays; Traffic models; Traffic queuing; Traffic simulation

Spillback effects (Traffic)

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB, ATRI

Jan 25 2010 11:22AM

• Analysis of Left-Turn Saturation Flow Rates and Capacity at Signalized Intersections
• Assessing the Benefits of Incident Management Systems: Combining Freeway Facility Procedures from the "Highway Capacity Manual" and Data Archives of Intelligent Transportation Systems
• Categorizing Freeway Flow Conditions by Using Clustering Methods
• Consistency of Stochastic Capacity Estimations
• Control Delay at Signalized Diamond Interchanges Considering Internal Queue Spillback
• Differentiated Analysis of Level of Service F Within the German "Highway Capacity Manual"
• Empirical Analysis of Effects of Wait Time and Rain Intensity on Driver Left-Turn Gap Acceptance Behavior
• Estimating Performance on Two-Lane Highways: Case Study Validation of a New Methodology
• Estimating Sustained Service Rates at Signalized Intersections with Short Left-Turn Pockets: Mesoscopic Approach
• Level of Service: 2010 and Beyond
• Modeling Impedance Effects of Left Turners from Major Streets with Shared Short Lanes at Two-Way Stop-Controlled Intersections
• Modified Critical Movement Analysis Approach for Signalized Intersections
• Pedestrian Delay at Signalized Intersections with a Two-Stage Crossing Design
• Predicting Arrival Flow Profiles and Platoon Dispersion for Urban Street Segments
• Urban Street Performance: Level of Service and Quality of Progression Analysis