Crash Modification Factors for Chevrons in Iowa

Details

• Creators:
  Hallmark, Shauna L. ; Goswamy, Amrita
• Corporate Creators:
  Midwest Transportation Center ; Iowa State University. Center for Transportation Research and Education
• Corporate Contributors:
  United States. Dept. of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Warning signs
  • Traffic signs
  • Highway curves
  • Traffic safety
  • Highway safety
  • Chevrons
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa ; United States
• Corporate Publisher:
  Midwest Transportation Center
• Abstract:
  Although chevron alignment signs have been utilized for some time along horizontal curves, their effectiveness is not well documented. The Crash Modification Factors Clearinghouse includes crash modification factors (CMFs) for chevrons from 0.41 to 1.92 (FHWA 2015). The lack of documentation on the effectiveness of chevrons and the range of values for CMFs make it difficult for agencies to estimate the cost effectiveness of chevrons. As a result, the objective of this study was to develop a CMF for chevron alignment signs that can be used by Iowa agencies to help address crashes on curves. Chevrons provide additional emphasis and guidance for drivers. If spaced properly, chevrons can delineate the curve so that drivers can interpret the sharpness of the curve. Chevrons are intended to warn drivers of an approaching curve and because of their pattern and size define the direction and sharpness of a horizontal curve (Torbic et al. 2004).
• Format:
  PDF
• Funding:
  DTRT13-G-UTC37
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/35563/dot_35563_DS1.pdf
• File Type:
  [PDF - 731.66 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ab9283b213e2d8795dcd161ff16b26f8f224d8faa0ba703eb2f836c26f5fa059