This study was conducted to determine the effects of different sign types and lane drop panel messages on driver expectations at freeway interchange lane drops and major splits. Two laboratory experiments were conducted. The first investigated driver expectations regarding lane drop geometrics and route-and-destination expectations. The second experiment studied expectations regarding geometrics for both lane drop and major split interchanges. In the experiments, subject performance was measured in terms of choice correctness, response latency, and subjective certainty of the accuracy of each choice. The results indicate that lane drop panels significantly improve the correctness of driver's expectations of freeway interchange geometrics in terms of lane drop configurations. Of the panels tested, the MUST EXIT and EXIT ONLY messages were the most helpful in forming correct expectations. The efficiency of these messages relative to one another is influenced by specific interchange geometrics. Diagrammatic signs, with or without lane drop panels, functioned as well as conventional signs with panels at exits and were superior in all respects to conventional signs at splits. /Author/

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  • Corporate Authors:

    Federal Highway Administration

    Office of Research and Development, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Roberts, K M
    • Klipple, A G
  • Publication Date: 1976-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00141263
  • Record Type: Publication
  • Report/Paper Numbers: HS-019 049
  • Files: TRIS, USDOT
  • Created Date: Oct 26 1976 12:00AM