01558209

Component

https://doi.org/10.3141/2483-15

Weaving sections are common design elements on freeway facilities such as near ramps and freeway-to-freeway connectors. Traffic operational problems often exist at weaving areas even when traffic demands are less than capacity because of the complexity of vehicle interactions, resulting in poor level of service and potential safety problems. The objective of this research was to evaluate the methodology for analyzing freeway weaving in the Highway Capacity Manual 2010 (HCM 2010) and other methodologies for evaluating weaving, such as Level D and Leisch, that are used for design and analysis in California. The evaluation was based on the comparison of methods’ predictions with field data. Emphasis was placed on the evaluation of ramp weaves consisting of a one lane on-ramp followed by an off-ramp with a continuous auxiliary lane. The findings from the evaluation of the HCM 2010 method on existing California weaving sites (93 data points) indicated that the method overpredicted the traffic densities and associated loss at ramp weaves by 24% on average. Additional data were collected at three ramp weaving sites in San Diego, California, by using Bluetooth readers and video recordings. The HCM 2010 method was found to overpredict density by an average of 13.4%. The Level D and Leisch methods overpredicted density by about 3% on average compared with observed values. The HCM 2010 method underpredicted weaving section capacity when the weaving volume was above 30% of total weaving volume.

01587923

15-5137

English

pp 130–139

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369268

Print

Figures (8) ; References (14) ; Tables (2)

Freeway operations; Highway safety; Interchange ramps; Methodology; Weaving sections

San Diego (California)

Highways; Operations and Traffic Management; Planning and Forecasting; I73: Traffic Control

TRIS, TRB, ATRI

Dec 30 2014 1:43PM

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• Calibrating VISSIM for the German Highway Capacity Manual
• Effect of an Upstream Traffic Signal on the Capacity of a Downstream Two-Way Stop-Controlled Intersection
• Field-Derived Freeway Passenger Car Equivalents for Congested Conditions
• Generalized Effects of On-Street Parking Maneuvers on the Performance of Nearby Signalized Intersections
• Generating Scenarios of Freeway Reliability Analysis: Hybrid Approach
• Generic Speed–Flow Models for Basic Freeway Segments on General-Purpose and Managed Lanes in Undersaturated Flow Conditions
• Methodology to Compute Travel Time of a Roundabout Corridor
• On the Treatment of Trucks for Analysis of Freeway Capacity
• On the Treatment of Trucks in Roundabout Analyses
• Planning-Level Methodology for Freeway Facilities
• Relationship of Lane Width to Capacity for Urban Expressways
• Risk-Taking Behavior of Left-Turners in Gap Acceptance and Its Effects on Capacity Estimation at Signalized Intersections
• Updated Commercial Truck Speed Versus Distance–Grade Curves for the Highway Capacity Manual
• Vehicular Traffic Capacity at Unsignalized Crosswalks with Probabilistic Yielding Behavior