Identification of the Impact of Radius Ratio of Horizontal to Vertical Curves on Highway Safety

This paper is focused on the identification of the impact of radius ratio of vertical to horizontal curves (RV/H) on highway safety. Highway alignment facilities and statistics of traffic accidents of six highways from Washington State have been analyzed. The authors research shows that accident rate decreases with the increasing of RV/H as a whole and begins to keep a low level when the RV/H large enough (more than 14). And for safety reasons, RV/H should be at least larger than 10 in the segment of the coordination of the crest and horizontal curve. The authors research results also show optimum RV/H should be between 14 and 22 if radius of horizontal curves (RHC) are less than 3,000 ft, and the optimum RV/H should be larger than 14. Research results reveal that RV/H has important design guidance function. RV/H can be selected as reasonable index in horizontal and vertical alignment coordination design.


  • English

Media Info

  • Media Type: Web
  • Pagination: pp 4762-4775
  • Monograph Title: CICTP 2020: Transportation Evolution Impacting Future Mobility

Subject/Index Terms

Filing Info

  • Accession Number: 01768488
  • Record Type: Publication
  • ISBN: 9780784483053
  • Files: TRIS, ASCE
  • Created Date: Dec 9 2020 3:07PM