THE EFFECTS OF WEATHER AND ROAD CONDITION WARNINGS ON DRIVER BEHAVIOR

This study investigated the effects of a slippery road variable message sign (VMS) and a headway recommendation VMS on driver behavior as well as the user acceptance of the signs. The slippery road VMS included a slippery road pictogram with a snowflake symbol beneath it. The headway recommendation was assigned to each vehicle and its value depended on vehicle type, speed, and the prevailing road surface condition class. The signs were studied at three rural sites. When the road was slippery, the average speeds decreased 2-4 km/h due to the slippery road VMS at two sites. The speed reductions were usually larger in slippery (flashing VMS) than in possibly slippery conditions. The speed reductions were usually larger in the dark than in daylight. The speed reductions were noted at the loop detector station 500 m after the VMS, whereas significant speed reductions at the next loop detectors situated between 3 and 14 km ater the VMS could not be identified. The headway VMS decreased the proportion of headways below 1.5 seconds by 28-48 percent in good, and by 37-47 percent in slippery road conditions, and also had a minor effect on speeds. The study lasted for 2 years. The effects were considerably smaller during the second winter, indicating the existence of "novelty" effects.

  • Supplemental Notes:
    • Five volumes of papers and one volume of abstracts comprise the published set of conference materials.
  • Corporate Authors:

    VERTIS

    TORANOMOM 34 MORI BUILDING 1-25-5
    TORANOMON, MINATOKU, TOKYO 105  Japan 
  • Authors:
    • KULMALA, R
    • RAMA, P
  • Conference:
  • Publication Date: 1995-11

Language

  • English

Media Info

  • Pagination: p. 1831

Subject/Index Terms

Filing Info

  • Accession Number: 00723483
  • Record Type: Publication
  • Report/Paper Numbers: Volume 4
  • Files: TRIS
  • Created Date: Jul 29 1996 12:00AM