MOVING VIOLATION STUDY

TRAFFIC VIOLATION OCCURRENCE STUDIES WERE CONDUCTED BY DIRECT OBSERVATION OF LAW VIOLATIONS FROM SELECTED VANTAGE POINTS ALONG A BUSY HIGHWAY ROUTE. VIOLATIONS WERE PLENTIFUL AT EACH OF 15 SURVEY LOCATIONS ALONG US HIGHWAY 101 IN CALIFORNIA. IN MULTILANE TRAFFIC, NON-SPEEDING RISK VIOLATIONS WERE MORE COMMON THAN SPEEDING VIOLATIONS ONLY AT HEAVY VOLUME LOCATIONS. NON-SPEEDING RISK VIOLATIONS DID NOT CONSTITUTE AS HIGH A PERCENTAGE OF VOLUME AT THOSE SITES AS DID SPEEDING VIOLATIONS AT THE LIGHTER VOLUME SITES. FOLLOWING TOO CLOSELY WAS BY FAR THE PREDOMINANT NON- SPEEDING RISK VIOLATION AT ALL LOCATIONS. SLOW DRIVER, LEFT LANE WAS OBSERVED NEXT MOST FREQUENTLY, WITH LANE CHANGING VIOLATIONS ALMOST AS COMMON AS THE LATTER IN HEAVY VOLUME, BUT DECREASING CONSPICUOUSLY WITH VOLUME DECLINE. THE TOTAL VIOLATION COUNTS TAKEN BY MULTILANE LOCATION FOR PASSENGER VEHICLES WERE NEGATIVELY, BUT VERY WEAKLY RELATED TO THE VOLUME COUNTS AND TO ACCIDENTS. THE PERCENTAGE, NON-SPEEDING RISK VIOLATIONS/TOTAL VIOLATIONS WAS TAKEN AS A MEASURE OF THE DEGREE OF MULTILANE TRAFFIC FLOW RESTRAINT. SPEEDING VIOLATIONS COMPRISED AN EXTREMELY LARGE PORTION OF TOTAL VIOLATIONS ONLY IN LOCATIONS OF RELATIVELY LOW VOLUME, UNRESTRAINED TRAFFIC. A RANGE OF ABOUT 3% TO ABOUT 36% OF TRUCKS AND VEHICLES WITH TRAILERS COMMITTED SPEEDING VIOLATIONS AT MULTILANE LOCATIONS DURING THE BASE PERIOD. TRUCK (AND VEHICLE WITH TRAILER) BASE PERIOD SPEEDING VIOLATIONS WERE SUFFICIENTLY PREDICTABLE FROM VOLUME/ CAPACITY TO AFFORD A GENERALLY ACCURATE PICTURE FOR MULTILANE LOCATIONS.

• Supplemental Notes:
  • pp 1-80, 13 FIG, 38 TAB, 1 APP
• Corporate Authors:

  Calfornia Highway Patrol

  P.O. Box 942898
  Sacramento, CA  United States  94298-0001
• Publication Date: 1968-4

Subject/Index Terms

• TRT Terms: Following distance; Hazards; Highway capacity; Motion; Moving industry; Multilane highways; Risk assessment; Speed change lanes; Speed limits; Traffic crashes; Traffic lanes; Traffic regulations; Traffic surveys; Traffic volume
• Uncontrolled Terms: Change; Traffic laws; Traffic studies; Violations
• Old TRIS Terms: Following distance (Of vehicles)
• Subject Areas: Freight Transportation; Highways; Law; Safety and Human Factors;

Filing Info

• Accession Number: 00219979
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 18 1994 12:00AM