RELATIONSHIP BETWEEN WINTER ROAD SURFACE CONDITIONS AND VEHICULAR MOTIONS MEASURED BY GPS-EQUIPPED PROBE VEHICLES

In winter, one of the major concerns of drivers is the current road condition. Taxis, which move around ceaselessly over a wide area, have great potential as a sensor for detecting what the road surface conditions are like across a given area. In order to establish a method to estimate road conditions based on the vehicular motion of taxis, some field experiments were conducted using probe vehicles that fitted with vehicular motion sensors and a GPS device prior to the implementation to taxis. Some preliminary analyses were performed using the data measured on a test track, urban streets, and an expressway. The slip ratio, defined as the relative difference in speed between vehicle and tire wheel, was effective in indicating how slippery roads surfaces were. Taxi vehicular motion data were also collected for more than one month, although unlike the probe vehicles the wheel speed was not measured. Some features of vehicular motion specific to slippery roads were identified and the ability of road conditions to be discriminated, whether icy or dry, without using wheel speed data, was also examined

• Supplemental Notes:
  • Publication Date: 2003. Transportation Research Board, Washington DC. Remarks: Paper prepared for presentation at the 82nd annual meeting of the Transportation Research Board, Washington, D.C., January 2003. Format: CD ROM
• Corporate Authors:

  University of California, Berkeley

  California PATH Program, Institute of Transportation Studies
  Richmond Field Station, 1357 South 46th Street
  Richmond, CA  United States  94804-4648

  California Department of Transportation

  1120 N Street
  Sacramento, CA  United States  95814

  University of California, Berkeley

  Department of Electrical Engineering and Computer Sciences
  Berkeley, CA  United States  94720
• Authors:
  • Nakatsuji, Takashi
  • Kawamura, Akira
• Conference:
  • Transportation Research Board 82nd Annual Meeting
  • Location: Washington DC, United States
  • Date: 2003-1-12 to 2003-1-16
• Date: 2003

Language

• English

Media Info

• Pagination: 21 p.

Subject/Index Terms

• TRT Terms: Global Positioning System; Paratransit services; Probe vehicles; Traffic speed; Vehicle dynamics; Weather
• Subject Areas: Operations and Traffic Management; Public Transportation;

Filing Info

• Accession Number: 00962481
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Files: PATH, STATEDOT
• Created Date: Sep 2 2003 12:00AM