This circular presents a priority ranking of six research problem statements. The Delphi technique was used whereby individual committee members were instructed to evaluate each of the research problem statements for absolute rank, to allocate hypothetical research funds from a total research budget, to assess the probability of success, and to provide the rational for each evaluation. The problem statement having the highest priority was the synthesis of safety research related to traffic controls and roadway elements. An updated synthesis is needed because of a changing emphasis from construction of freeways to resurfacing, restoration, and rehabilitation, more demands for highway transportation dollars, increased concern for improving safety in construction and maintenance work zones, changing speed patterns, and possible traffic operational problems created by an emerging new mix of traffic. Operational limitations on the maximum number of freeway lanes in urban areas. The effect of short climbing grades on urban freeway operations under near saturated flow conditions, energy convention through truck-climbing lanes, vehicle equivalency and capacity including the effects of commercial and recreation vehicles on rural non-controlled access highways, and the effects of illumination on traffic operations on non-controlled access roads, were all given a low priority ranking.

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Filing Info

  • Accession Number: 00173949
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Mar 31 1980 12:00AM