The Last Impaired Mile: Challenges of Impaired Mobility in a Multimodal World

BACKGROUND The traffic safety community has worked for decades to put a taboo on impaired driving. While there remains a great deal of work still to do, progress has been made. For example, in recent years there has been anecdotal evidence of an increase in the number of individuals who drive to the end of a transit or commuter rail line, take transit or commuter rail into the city where they become impaired, take transit or commuter rail back to their car, and then drive home once returning to their car. This creates a new challenge, especially in suburban and rural areas which have limited options for traveling that so-called “last mile”. While progress has been made in reducing the overall number of impaired miles traveled, addressing safety concerns associated with the “last mile” remains a significant challenge. OBJECTIVES The objectives of this research are to 1) develop an improved understanding of the scope of the “last mile” problem in multimodal environments; 2) explore behavioral and risk factors that could be altered to change driver behavior; and 3) develop a toolkit of practical strategies for state highway safety offices and other stakeholders to help close the gap. Research questions addressed by the study might include: What is the extent of the problem – how many individuals are exiting transit and commuter rail stations in the last few stops impaired by drugs or alcohol, and how many individuals are then driving a vehicle to get home? What policy changes could be implemented to change behavior? How can the regional highway safety partners extend the risk perception of impairment to include that last mile traveled?


  • English


  • Status: Proposed
  • Funding: $250000
  • Contract Numbers:


  • Sponsor Organizations:

    Behavioral Traffic Safety Cooperative Research Program

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

    Governors Highway Safety Association

    444 N. Capitol Street, NW, Suite 722
    Washington, DC  United States  20001

    National Highway Traffic Safety Administration

    1200 New Jersey Avenue, SE
    Washington, D.C.  United States  20590
  • Project Managers:

    Retting, Richard

  • Start Date: 20240618
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01922050
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: BTS-39
  • Files: TRB, RIP
  • Created Date: Jun 18 2024 5:14PM