This report summarizes background information and presents the development of procedures for preparing and updating the lnterstate Safety Improvement Program. There are two major sections: (1) development of procedures for identifying safety needs and (2) development of procedures for prioritizing safety needs. Related to the identification of needs are eleven subsections which are based on historical data, inventories of existing facilities, and analysis of current data. Several accident surveillance procedures were used to identify sites, sections, and elements of the roadway which warrant improvements. Procedures for prioritizing safety needs are based on summaries of data from two reports by the Division of Research. One is based on the application of dynamic programming to the spot-safety improvement program and the other relates the use of dynamic programming for selecting resurfacing projects. Application of the procedures as outlined in this report should provide the guidance and overall support information necessary for development of a safety improvement program as specified in Federal Highway Administration Program Manual, 6-8-2-1.

Report Date


Report Number

No. 495

Digital Object Identifier



The contents of this report reflect the views of the authors who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Bureau of Highways. This report does not constitute a standard, specification, or regulation.