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Examining Optimal Sight Distances at Rural Intersections

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    University of Minnesota. Department of Mechanical Engineering. HumanFIRST Program
  • Corporate Contributors:
    Local Road Research Board
  • Subject/TRT Terms:
  • Publication/ Report Number:
    MN/RC 2019-34
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Edition:
    Final Report
  • Corporate Publisher:
    Minnesota. Department of Transportation. Office of Research & Innovation
  • Abstract:
    Decisions made regarding driver sight distance at rural intersections are complex and require considerations for safety, efficiency, and environmental factors. Sight distance, cross-traffic velocity, and vehicle placements significantly affect driver judgment and behavior at these intersections. A series of rural, two-lane thru-STOP simulated intersections with differing sight distances and traffic speeds were created and then validated by county and state engineers. Experimental data from 36 participants in a time-to-collision (TTC) intersection crossing judgment task and a rural highway thru-STOP intersection driving simulation task was analyzed to clarify the influence of rural thru-STOP intersection characteristics on driving performance and decision-making. Results demonstrated that longer sight distances of 1,000 ft. and slower crossing speeds (i.e., 55 mph) were more accommodating for participants attempting to select gaps and cross from the minor road, corresponding with (1) lower mental workload, perceived risk, difficulty, and anxiousness, and (2) better performance in terms of estimated crash rate, and larger TTCs. Second, longer distances of 1,000 ft. appear to aid drivers’ responsiveness on the main road approaching an intersection, specifically when another driver on the minor road runs the stop sign. Minor road drivers positioned close to the roadway at the stop sign, compared to standard stop bar placement, tended to help reduce the speed of main road drivers. Overall, results demonstrated a systematic improvement in the performance of both minor and major road drivers with the implementation of a 1,000-foot sight distance at rural thru-STOP intersections.
  • Format:
    PDF
  • Funding:
    (c)1003325 (wo) 25
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:26a3bc70b7252c00de0da646f6d2b70644c82f77c444cf88243026b26b307148
  • Download URL:
  • File Type:
    Filetype[PDF - 3.69 MB ]
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