An adequacy-rating procedure was developed for use in priority programming for highway reconstruction. The procedure makes use of 15 roadway and traffic elements to rate highway sections in urban and rural areas based on 100 points. Condition elements (35 points) include a subjective rating of highway foundation, pavement surface, drainage, and maintenance economy. Safety elements (35 points) are stopping sight distance, highway alignment, skid resistance, accident experience, and traffic control devices. Service elements (30 points) include shoulder width, passing opportunity, rideability, surface width, volume/capacity ratio, and average speed.

Some of the advantages of the new procedure include computerized analysis of all input data with detailed output summaries. All highway sections are referenced by milepoints, reference points, and federal-aid route numbers. The procedure incorporates the 1978 design standards. New adequacy concepts include the use of the Rate-Quality Control method for accident analysis, a formal rating scheme for traffic control devices, and a rating of lane width based on design level of service. Other advantages include measured skid numbers and a roadway condition rating guide for subjective evaluations of six different roadway elements.

Report Date


Report Number

No. 508

Digital Object Identifier



Offered for publication by the Transportation Research Board.