Speed Limits Set Lower than Engineering Recommendations [Project Summary Report]

Details

• Creators:
  Donnell, Eric T. ; Gayah, Vikash V. ; Yu, Zhengyao ; Li, Lingyu ; DePrator, Anthony
• Corporate Creators:
  Thomas D. Larson Pennsylvania Transportation Institute
• Corporate Contributors:
  Montana. Dept. of Transportation. Research Programs ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Speed limits
  • Traffic safety
  • Highway safety
  • Traffic law enforcement
  • Before and after studies
  • Compliance
  • Crash injuries
  • Crash rates
  • Fatalities
  • Operating speed
• Publication/ Report Number:
  Project Summary Report: 8225-001
• Resource Type:
  Tech Report
• Geographical Coverage:
  Montana
• Corporate Publisher:
  Thomas D. Larson Pennsylvania Transportation Institute
• Abstract:
  The Montana Department of Transportation (MDT) generally ensures that posted speed limits are set in accordance with engineering recommendations, which means that speed limits are typically set such that they are about equal to the observed 85th-percentile operating speed. However, for a variety of reasons, including the presence of school zones, citizen requests, political pressure, and perceived safety issues, posted speed limits on several roadways in Montana have been reduced to values lower than those recommended for the facility by engineering guidelines. This study examined the safety and operational effects of posting speed limits lower than engineering recommendations.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31485/dot_31485_DS1.pdf
• File Type:
  [PDF - 292.36 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:a5520622974ecb2d8d7103305e7a3e328e41e063cfeef9e1cdf9f3c02c9b18c3