Crash Risks by Commercial Motor Vehicle (CMV) Driver Schedules, Phase I

The objective of this project was to collect hours-of-service (HOS) and crash data to analyze how HOS provisions are being used and the impact of driver schedules on crash risk. The Federal Motor Carrier Safety Administration (FMCSA) conducted a study that evaluated the impact of driving hours, working hours, and breaks on safety critical events (SCEs) (Blanco, M., et. al., 2011). The study included 99 drivers who drove a total of 700,000 miles, during which naturalistic driving video and data were collected. That study found that (1) as the number of driving hours increased, so did the number of SCEs, (2) when evaluating the interaction between driving and non-driving work, a much greater time-on-task effect emerges for drivers driving late in their work shift, and (3) driving breaks decrease risk in the hour after a break. The present study collected additional data to answer important questions related to driver schedules and how these factors impact overall driver performance and fatigue. This study is being completed in phases. In Phase I, the research team collected HOS and crash data. In Phase II, the research team will use the data collected in Phase I to analyze crash risk as it relates to various aspects of the HOS provisions. This study will analyze: (1) relative crash risk by hour of driving; (2) relative crash risk by hour of driving per week; (3) relative crash risk of driving breaks; (4) relative crash risk as a function of recovery periods; and (5) how each of the HOS provisions is being used. In addition, the study will design, develop, and deliver a database so that the data collected in this study can be used for future research efforts. A database of the HOS and crash data for use in future research efforts.

  • Record URL:
  • Supplemental Notes:
    • Milestones: May 2014: Phase I contract awarded; July 2014: Kick-off meeting; October 2014: Peer review meeting; November 2015: Phase I complete.


  • English


  • Status: Completed
  • Funding: $267,000
  • Sponsor Organizations:

    Federal Motor Carrier Safety Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Federal Motor Carrier Safety Administration

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

    Hallquist, Theresa

  • Performing Organizations:

    Virginia Tech Transportation Institute

    3500 Transportation Research Plaza
    Blacksburg, Virginia  United States  24061
  • Start Date: 20140500
  • Expected Completion Date: 20180401
  • Actual Completion Date: 20151102

Subject/Index Terms

Filing Info

  • Accession Number: 01592554
  • Record Type: Research project
  • Source Agency: Federal Motor Carrier Safety Administration
  • Files: RiP, USDOT
  • Created Date: Mar 2 2016 1:41PM