A STUDY OF THE IMMEDIATE EFFECTS OF ENFORCEMENT ON VEHICULAR SPEEDS

THE EFFECTS ON VEHICULAR SPEEDS OF TWO TYPES OF ENFORCEMENT SYMBOLS IN OR ADJACENT TO THE TRAFFIC STREAM ON RURAL ROADWAYS WERE EXAMINED. THE ENFORCEMENT UNITS OF THE NORTH CAROLINA HIGHWAY PATROL WERE: A SINGLE STATIONARY PATROL VEHICLE PARKED ADJACENT TO THE ROADWAY IN A POSITION VISIBLE TO ONCOMING TRAFFIC; AND A SINGLE PATROL VEHICLE MOVING IN THE STREAM OF TRAFFIC. DATA WERE COLLECTED APPROXIMATELY 1 1/4 MILES UPSTREAM FROM THE PATROL UNIT AND 1 1/4 MILES DOWNSTREAM FROM THE UNIT. CHANGE IN SPEED RESULTED IN THE FINAL CONCLUSIONS: ANALYSIS INDICATED REDUCTION IN MEAN SPEED, VARIANCE AND IN THE PERCENTAGE OF VEHICLES TRAVELING ABOVE THE POSTED SPEED LIMIT AND THE SPEED LIMIT PLUS TOLERANCE WHEN THE STATIONARY UNIT WAS EMPLOYED ON ALL TEST TRACKS UNDER ALL TEST CONDITIONS; ANALYSIS SHOWED NO SIGNIFICANT CHANGE OR A SIGNIFICANT INCREASE IN THE CORRESPONDING MEASUREMENTS BETWEEN THE UPSTREAM AND DOWNSTREAM POINTS WHEN THE MOVING PATROL UNIT WAS INTRODUCED INO THE TRAFFIC STREAM. /HSL/

• Record URL:
  http://www.hsrc.unc.edu/research_library/PDFs/Study70.ocr.pdf
• 
• Supplemental Notes:
  • 50 Pp, 15 REF
• Corporate Authors:

  University of North Carolina, Chapel Hill

  Chapel Hill, NC  United States  27514
• Authors:
  • Council, F M
• Publication Date: 1970-3

Subject/Index Terms

• TRT Terms: Police patrol; Rural highways; Speed control; Speed limits; Traffic flow; Vehicles
• Uncontrolled Terms: Enforcement
• Subject Areas: Highways; Operations and Traffic Management; Vehicles and Equipment;

Filing Info

• Accession Number: 00226072
• Record Type: Publication
• Source Agency: Highway Safety Literature
• Files: TRIS
• Created Date: Oct 3 1971 12:00AM