ESTABLISHING RELATIONSHIP OF LEVEL OF SERVICE AND HIGHWAY SAFETY

STUDIES FROM 1959 THROUGH 1970 HAVE DEVELOPED CURVES RELATING ACCIDENT RATE INCREASES TO (1) TRAFFIC VOLUME INCREASES (UP TO THE POINT CAPACITY IS REACHED, AFTER WHICH THE RATE DECLINES) AND (2) TRAFFIC SPEEDS ABOVE AND BELOW THE DESIGN SPEED. FROM THESE TWO CURVES IT IS POSSIBLE TO PLOT ACCIDENT RATES AS A FUNCTION OF VOLUME: CAPACITY RATIO, I.E., AS A FUNCTION OF LEVEL OF SERVICE. FINALLY, IT IS SHOWN THAT INTRODUCTION OF THE FACTOR OF SAFETY SUBSTANTIALLY ALTERS THE SHAPE OF EACH LEVEL OF SERVICE WITHIN THE CURVE COVERING THE ENTIRE RANGE.

• Authors:
  • Yu, J C
• Publication Date: 1972-10

Media Info

• Features: Figures; References;
• Pagination: p. 50-2
• Serial:
  • Traffic Engineering, Inst Traffic Engr
  • Volume: 43
  • Issue Number: 1

Subject/Index Terms

• TRT Terms: Crash rates; Design speed; Highway capacity; Highway safety; Level of service; Speed
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00222063
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 17 1973 12:00AM