The technology is described of SCAN (Surface Condition ANalyzer) which enables Caltrans to manage highway operation during inclement weather. SCAN reports pavement temperatures and indicates whether the road is wet or dry, and if water, frost, ice, snow, or chemicals are present. It also shows air temperature, humidity, wind speed and direction, and dew point and senses when precipitation is falling. The system operates with hockey puck-shaped epoxy sensosrs imbedded in the road surface. The sensors have thermal properties similar to the pavement. A capacitor within the sensor measures electrical charges which differ when water, snow, ice, or chemicals are present. A thermistor measures surface temperatures. Further details of the system are described. SCAN systems are used in 48 states including California, and in 8 countries.

Media Info

  • Pagination: p. 10-11
  • Serial:
    • AASHTO Quarterly Magazine
    • Volume: 70
    • Issue Number: 4
    • Publisher: American Association of State Highway and Transportation Officials (AASHTO)
    • ISSN: 0147-4820

Subject/Index Terms

Filing Info

  • Accession Number: 00618471
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Jan 31 1992 12:00AM