AT-GRADE VERSUS GRADE-SEPARATED INTERCHANGES

Retrospective analyses of several bypasses were undertaken to determine if accident cost savings would have justified higher initial costs of interchanges. Conditions to be considered in reaching a rational decision are the applicable warrants: a freeway development, elimination of bottlenecks or sport congestion, elimination of hazards, site topography, road-user benefits, and traffic volume warrant. Cost-benefit ratios were calculated from data available from 35 major intersections. It is apparent that even with the best possible controls on these bypasses, numerous accidents will continue to occur. Slightly over three-quarters of the accidents could be prevented with the addition of interchanges and access control.

• Corporate Authors:

  Institute of Traffic Engineers

  2029 K Street, NW
  Washington, DC    20006
• Authors:
  • Agent, K R
• Publication Date: 1975-6

Media Info

• Pagination: p. 22-24
• Serial:
  • Traffic Engineering
  • Volume: 45
  • Issue Number: 6
  • Publisher: Institute of Traffic Engineers

Subject/Index Terms

• TRT Terms: Access control (Transportation); Analysis; Benefit cost analysis; Benefits; Bottlenecks; Bypasses; Costs; Grade separations; Hazards; Interchanges; Intersections; Prevention; Safety; Topography; Traffic congestion; Traffic volume; Warrants (Traffic control devices)
• Uncontrolled Terms: Access control
• Old TRIS Terms: Traffic warrants
• Subject Areas: Design; Finance; Highways; Safety and Human Factors; Security and Emergencies;

Filing Info

• Accession Number: 00098610
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 18 1975 12:00AM