This report provides a preliminary analysis of intersection-related, left turn across path (LTAP) crashes and applicable countermeasure concepts for the Intelligent Vehicle Highway System (IVHS) program. An LTAP crash occurs when the subject vehicle (SV) approaches an intersection, attempts to turn left, and either strikes or is struck by the principal other vehicle (POV) traveling in the opposing traffic lanes. A detailed analysis of 154 such crashes showed that 49% are caused by drivers who were unaware of the oncoming vehicle, and that 30% were caused by drivers who saw but misjudged the velocity/gap of the oncoming vehicle. Moreover, two LTAP crash subtypes are identified: the SV slows, but does not stop, begins the left turn, and strikes or is struck by the oncoming POV in 71.6% of these crashes; and the SV stops, then proceeds with the left turn, and strikes or is struck by the POV in the remaining 28.4% of these crashes. The crash avoidance system (CAS) concepts discussed in this report include driver warnings, partially automatic vehicle control systems, and fully automatic vehicle control systems. This report concludes with a number of research needs to better understand LTAP crashes and guide CAS development.

  • Supplemental Notes:
    • Firms contracting to RSPA/VNTSC: Battelle, 505 King Avenue, Columbus, OH 43201-2693; and Calspan Corporation, P.O. Box 400, Buffalo, NY 14225.
  • Corporate Authors:

    Volpe National Transportation Systems Center

    55 Broadway
    Cambridge, MA  United States  02142

    National Highway Traffic Safety Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Chovan, J D
    • Tijerina, L
    • Everson, J H
    • Pierowicz, J A
    • Hendricks, D L
  • Publication Date: 1994-9


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 52 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00669055
  • Record Type: Publication
  • Report/Paper Numbers: DOT-VNTSC-NHTSA-94-4, HS-808 154
  • Contract Numbers: HS421/S4007
  • Files: HSL, TRIS, USDOT
  • Created Date: Nov 29 1994 12:00AM