Evaluation of Lane Reduction "Road Diet" Measures and their Effects on Crashes and Injuries

Details

• Corporate Creators:
  United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
• Subject/TRT Terms:
  • Before and after studies
  • Crash rates
  • Crash severity
  • Crash types
  • Four lane highways
  • Highway design
  • Three lane highways
  • Design
  • Highways
  • Safety and Human Factors
  More +
• Publication/ Report Number:
  FHWA-HRT-04-082
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States;Washington;California
• Edition:
  Final Report
• Corporate Publisher:
  Turner-Fairbank Highway Research Center ; United States. Federal Highway Administration
• Abstract:
  Road diets are often conversions of four-lane undivided roads into three lanes (two through lanes and a center turn lane). The fourth lane may be converted to bicycle lanes, sidewalks, and/or on-street parking. In other words, existing space is reallocated; the overall area remains the same. This study evaluated road diets at several locations in California and Washington. Key findings of this study are: 1) Crash frequencies at road diets in the after period were approximately 6% lower than at the corresponding comparison sites; 2) Crash rates did not change significantly from the before period to the after period; 3) Road diet conversions did not affect crash severity; and 4) Road diet conversions did not result in a significant change in crash types.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/35853/dot_35853_DS1.pdf
• File Type:
  [PDF - 213.99 KB]
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:209d98ae4802c5f627f98cd01b7423e11d1c67f02175cb2f65f796be7fd8d5a97c99af94fecd89bb6320bd806d807ec921f39ab5019599e0bc73b0fff702ed45