AUTOMATIC ICY ROAD SIGN STUDY

A BRIDGE DECK SURFACE WHEN IT BECOMES ICY PRESENTS A SERIOUS HAZARD TO A MOTORIST. IN SOME STATES HE IS WARNED OF THE IMPENDING DANGER BY SIGNS WHICH ARE PUT OUT AND TAKEN IN AS NEEDED. HOWEVER, THEY REQUIRE SOMEONE TO MANUALLY DO THIS OPERATION. ACCORDINGLY, THIS REPORT SUMMARIZES THE RESULT OF TESTS TO EVALUATE THE ABILITY OF A CONTROL DEVICE TO DETECT, AND AUTOMATICALLY INDICATE WHEN SUCH AN ICY CONDITION EXISTS. THE ICY CONDITION IS DETERMINED BY ELECTRONIC SENSORS WHICH ARE INSTALLED IN THE PAVEMENT AND DETECT WHEN BOTH THE TEMPERATURE OF THE PAVEMENT IS LESS THAN 30 DEGREES F AND A FILM OF WATER EXISTS. ONLY WHEN THESE TWO CONDITIONS EXIST ARE THE ICY ROAD WARNING SIGNS AUTOMATICALLY TURNED ON. THE OPERATION OF THE SIGNS WAS EVALUATED BY ANALYZING THEIR OPERATIONAL RECORDS. ALSO, CONTINUOUS RECORDINGS OF AIR TEMPERATURE AND RELATIVE HUMIDITY WERE TAKEN SIMULTANEOUSLY. AN IMPORTANT CONCLUSION OF THE STUDY IS THAT THE PROPER INSTALLATIONAL LOCATION AND ADJUSTMENT OF THE TEMPERATURE AND MOISTURE SENSORS IS CRITICAL. /BPR/

  • Supplemental Notes:
    • Hpr-1/4/, BPR-5, CHD-1475-4
  • Corporate Authors:

    Colorado Department of Highways

    Planning and Research Division, 4201 East Arkansas Avenue
    Denver, CO  United States  80222
  • Publication Date: 1966-8

Subject/Index Terms

Filing Info

  • Accession Number: 00205343
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Nov 1 1994 12:00AM