Safety comparison of roadway design elements on urban collectors with access : final report, April 2009.

Details

• Creators:
  Ozbay, Kaan ; Yanmaz-Tuzel, Ozlem ; Ukkusuri, Satish ; Bartin, Bekir
• Corporate Creators:
  New Jersey. Department of Transportation. Bureau of Research
• Subject/TRT Terms:
  • Expressways
  • Urban highways Express highways--Design and construction
  • Express highways--Safety measures
  • Traffic safety--New Jersey
• Publication/ Report Number:
  FHWA-NJ-2009-008
• Resource Type:
  Tech Report
• Geographical Coverage:
  New Jersey
• Edition:
  Final report.
• Corporate Publisher:
  New Jersey. Dept. of Transportation
• Abstract:
  The main goal of this study identified by NJDOT can be defined as “the quantification of the effects of ; management treatments on roadway operations and safety on urban collectors with access”. ; Since, urban collector road runs through highly diversified areas, various factors have to be considered ; when before-and-after comparisons of improvements in terms of safety are conducted in this study. For ; 25-40 mph urban collectors with access, these are: ; 1. Increase in lane widths (10' or 11' to 12'), ; 2. Construction of 4,6,8, or 10 foot shoulders, ; 3. Removal of trees in median and border areas, ; 4. Installation of guide rails, and vertical & horizontal geometry changes to improve sight distances. ; Before and after analysis for these countermeasures was conducted via several approaches, including ; naïve approach, analysis via control groups, analysis via Empirical Bayes approach, and analysis via ; Full Bayes approach. After conducting before-and-after analysis, Crash Reduction Factors (CRF) were ; estimated for each countermeasure. The individual CRF values and their relative order among different ; countermeasures are similar to the values in the literature. In particular, improvements in vertical and ; horizontal alignment results in highest reduction in the accident rate, followed by adding shoulders, ; median barrier installation, lane width increase, and guide rail installation.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17137/dot_17137_DS1.pdf
• File Type:
  [PDF - 1.91 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b4fd5dcfb267ae79e341f090ea290c53a318b234351b9d660ee358fdf23ae40617b1a3bb8ee3e69c280a76e2f9a73e9319343b3f3daf1fe67e515dbb7614acc8