Highway Safety Manual Crash Prediction Models of Arterial Weaving Segments

More than half of U.S. roadway deaths and nearly two-thirds of pedestrian fatalities occur on non-freeway arterials. Arterial sections with weaving maneuvers are complex for all road users to navigate and traverse without incidents or collisions. The Code of Federal Regulations requires determination of whether the location, configuration, geometric design, and signing related to a proposed change in access may be reasonably expected to serve the anticipated traffic of the Interstate system in a manner that is conducive to safety, durability, and economy of maintenance. For many existing and proposed alternative designs, the safety of the weave is not quantified between ramps. Examples include cloverleaf designs with adjacent intersections and crossing weaves from ramps to downstream left turns. A better understanding of crash outcomes is needed for a variety of rural and urban speeds and contexts. As part of NCHRP Project 15-66, “Operational Performance and Safety Effects of Arterial Weaving Sections,” crash data and conflict data obtained in the field and a driving simulator were analyzed to assess the safety performance of several types of arterial weaving sections. The results of the safety analysis did not provide a definitive relationship between the length and vehicle maneuvers of arterial weaving sections and crashes or conflicts; however, sufficient information was found to suggest additional research in this area would yield promising results toward developing a methodology for predicting the safety performance of arterial weaving sections suitable for inclusion in the AASHTO Highway Safety Manual (HSM). The objective of this research is to develop a crash prediction methodology, safety performance functions (SPFs), to assess different types of arterial weaving sections, suitable for inclusion in the HSM.

• Record URL:
  • http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=6055
• Supplemental Notes:
  • Contract to a Performing Organization has not yet been awarded.

Language

• English

Project

• Status: Proposed
• Funding: $600,000.00
• Contract Numbers:

  Project 17-150

• Sponsor Organizations:

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Deng, Zuxuan

• Start Date: 20260608
• Expected Completion Date: 0
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Arterial highways; Crash risk forecasting; Driving simulators; Highway safety; Safety analysis; Weaving sections
• Identifier Terms: Highway Safety Manual; Safety Performance Functions
• Subject Areas: Design; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 01992183
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 17-150
• Files: TRB, RIP
• Created Date: Jun 9 2026 2:53PM