EFFECTIVENESS OF SPEED LIMITS ON RURAL ROADS AND MOTORWAYS

AN ANALYSIS IS MADE OF THE EFFECTS ON VEHICLE SPEED AND ACCIDENT RATES OF CHANGES IN GREAT BRITAIN'S SPEED LIMITS. THE ANALYSIS RELATES TO SPECIFIC ROAD SECTIONS, VARYING IN LENGTH FROM 19 TO 400 MILES, ON WHICH LIMITS WERE RAISED OR LOWERED OR IMPOSED FOR THE FIRST TIME. VEHICLE-SPEED AND ACCIDENT-RATE REDUCTION WERE STATISTICALLY SIGNIFICANT FOR 40- AND 50-MPH ZONES (P=0.95). REDUCTIONS WITH THE 60-MPH LIMIT HAVE NOT YET BEEN TREATED STATISTICALLY, AND REDUCTIONS WITH THE 70-MPH LIMIT HAVE NOT BEEN TREATED SUCCESSFULLY AS YET BECAUSE OF THE DIFFICULTY OF CALCULATING CONFIDENCE LIMITS. WITH RESPECT TO THIS LAST LIMIT, IT IS NOTED THAT REDUCTIONS IN SPEEDS AND CASUALTIES WERE GREATER ON THE FASTER ROADS A STRONG INDICATION THAT THE BENEFICIAL EFFECTS WERE OCCASIONED BY THE OPERATION OF THE SPEED LIMIT. AN APPENDIX TABLIFIES CRITERIA FOR SPEED OF TRAFFIC BEFORE IMPOSITION OR ALTERATION OF THE LIMIT, CHARACTER OF ENVIRONMENT TO ROAD, TRAFFIC COMPOSITION, CHARACTER OF ROAD, AND CASUALTY RATES FOR THE 3-, 40-, 50-, AND 60-MPH LIMITS.

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Filing Info

  • Accession Number: 00228043
  • Record Type: Publication
  • Report/Paper Numbers: HS-008 841
  • Files: HSL, TRIS
  • Created Date: May 10 1983 12:00AM