• Skip to primary navigation
  • Skip to main content
  • About
  • Contact
  • Listserv
  • Facebook
  • Twitter
  • Login/Register
workzonesafety.org

National Work Zone Safety Information Clearinghouse

Library of Resources to Improve Roadway Work Zone Safety for All Roadway Users

  • Crash Information
    • Work Zone Fatal Crashes and Fatalities
    • National Estimates of Total and Injury Work Zone Crashes
    • Work Zone Fatal Crash Facts
    • Other Work Zone Crash Related Resources
  • Flagger Information
    • Flagger Training and Certification Requirements by State
    • Flagging Resources Developed Under the FHWA Work Zone Safety Grant Program
    • Classes
    • Videos
    • Job Resources
  • Training
    • FHWA Work Zone Safety Grant Products
    • Roadway Safety Training Program
    • Online Learning Management System
    • Training Courses and Programs
    • Training Videos
    • ARTBA
    • ATSSA
    • NHI
    • NSC
    • LTAP/TTAP
    • WSU
  • Events and Conferences
    • National Work Zone Awareness Week
    • Work Zone Safety Conferences
    • Other Work Zone Related Conferences
    • 2020 Transportation Construction Safety Events Calendar
  • Data Resources
    • Searchable Databases
    • Public Awareness
    • Laws, Regulations, Standards, and Policies
    • Manual on Uniform Traffic Control Devices (MUTCD)
  • Hot Topics
    • Improving Large Truck Safety in Work Zones
    • Smarter Work Zones
    • Transportation Management Plans
    • Accommodating Pedestrians
    • Rear End Crashes
    • Minimizing Construction Interferences with Traffic
    • Managing Speeds
    • Mobile/Short Duration Work Zones
    • Reducing Worker Run-overs and Back-overs
    • Working at Night
    • Reducing Worker Fatigue and Distraction Risks
You are here: Home / Publications / Development of Breakdown Probability Models and Heavy Vehicle Passenger Car Equivalents for Rural Freeway Work Zones

Development of Breakdown Probability Models and Heavy Vehicle Passenger Car Equivalents for Rural Freeway Work Zones

Author/Presenter: Jehn, Nicholas L.; Turochy, Rod E.
Abstract:

With nearly nine million lane-miles of public roadway and an economy driven by the automobile, interruptions to normal traffic operations for construction and maintenance are inevitable in the U.S.A., but the substantial safety and mobility impacts associated with queueing at freeway lane closures are mitigable. The current freeway work zone capacity methodology in the 6th edition of the Highway Capacity Manual is a vast improvement over historical guidance but still approaches the issue differently than research suggests agencies and practitioners should. Namely, a capacity defined by the mean queue discharge rate is deterministic and fails to account for the stochastic nature of traffic flow and breakdown. These core issues were addressed in this research by developing a methodology for obtaining probabilistic estimates of rural freeway work zone capacity from simulated data in PTV Vissim. Results for a two-to-one lane closure were presented as a series of breakdown probability distributions to demonstrate the viability of this methodology. The data indicated that the impact of trucks on freeway capacity is exacerbated in the presence of lane closures and led to the development of work zone capacity-based passenger car equivalents. Such a procedure may be extended to freeway facilities exhibiting different geometric, traffic, and environmental characteristics and utilized by agencies to make data-driven, risk tolerance-based planning, design, and operations decisions at freeway work zones.

Source: Transportation Research Record: Journal of the Transportation Research Board
Publisher: Transportation Research Board
Publication Date: September 27, 2020
Source URL: Link to URL
Publication Types: Books, Reports, Papers, and Research Articles
Topics: Heavy Vehicles; Highway Capacity; Lane Closure; Passenger Car Equivalence; Rural Highways; Traffic Models; Work Zone Capacity; Work Zones

Copyright © 2021 American Road & Transportation Builders Association (ARTBA). The National Work Zone Safety Information Clearinghouse is a project of the ARTBA Transportation Development Foundation. It is operated in cooperation with the U.S. Federal Highway Administration and Texas A&M Transportation Institute. | Copyright Statement · Legal Notices/Policies · Disclaimer
American Road and Transportation Builders Association Transportation Development Foundation, American Road and Transportation Builders Association U.S. Department of Transportation Federal Highway Administration Texas A&M Transportation Institute