NIGHTTIME INSPECTION OF TRAFFIC CONTROL DEVICES

WORKING FROM A MOVING VEHICLE TRAVELING BETWEEN 20 AND 40 MPH, THE RATING WAS DONE FROM A DISTANCE WHERE THE MOST REFLECTIVITY OCCURRED, WHICH VARIED FROM SIGN TO SIGN, DEPENDING UPON ITS POSITION, ANGULARITY, AND AGE. THE VEHICLE USED WAS A PICK-UP TRUCK WITH A NON-TINTED WINDSHIELD AND SINGLE HEADLIGHTS. NORMALLY, ONLY ONE PASS IN EACH DIRECTION WAS NEEDED PER ROAD. THE SIGNS WERE RATED AS A DRIVER WOULD SEE THEM. IN URBAN AREAS, THE RATING WAS DONE BY LOW BEAM HEADLIGHT; AND, IN RURAL AREAS, HIGH BEAM HEADLIGHT WAS USED. THE REPLACEMENT RATE FOR THOSE SIGNS INVENTORIED WAS APPROXIMATELY 16% OR 1,600 SIGNS, WITH 11% MISSING AND 6% FOUND TO BE NON-FUNCTIONAL UNDER NIGHTTIME CONDITIONS. THE FIELD WORK COVEREC 1,400 MILES OF THE 2,000 MILE COUNTRY ROAD SYSTEM.

• Corporate Authors:

  San Diego, California Eng Dept

  ,    
• Authors:
  • TAYLOR, H M
• Publication Date: 1970

Media Info

• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Night visibility; Ratings; Reflective signs; Reflectorized materials; Traffic control devices
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00226749
• Record Type: Publication
• Source Agency: Highway Safety Literature
• Files: TRIS
• Created Date: Apr 11 1974 12:00AM