An improved bridge safety index for narrow bridges.

Details

• Creators:
  Gandhi, R. B. V. ; Lytton, Robert L.
• Corporate Creators:
  Texas Transportation Institute
• Subject/TRT Terms:
  • Narrow bridges
  • Highway safety
  • Traffic safety
  • Narrow Bridges
  • Bridge Safety Index
  • Funding Priorities
• Publication/ Report Number:
  FHWA/TXf84/26+233-2F
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas. Department of Highways and Public Transportation. Transportation Planning Division.
• Abstract:
  In this report, a new bridge safety index is developed based upon an extensive ; statistical study of accident data on 78 bridges. A total of 655 accidents ; were recorded at these bridges over the six-year period between 1974 and 1979. ; Cluster analysis showed that 26 of the bridges could be grouped into a "less-safell ; class and the remaining 52 bridges culstered into the Ilmore-safell group. Assigning ; a score of 0 to the less-safe group and 1 to the more-safa group, logistic regression ; analysis was used to develop an equation for the probability that a ; bridge is safe. The R2 of the equation is 0.53 and i.ncludes the following variables ; bridge wid~h, bridge length, ADT, vehicle speed, grade continuity, shoulder reduction, ; and traffic mix. A sensitivity analysis shows that bridge safety may be ; improved most by reducing vehicle speed and secondly by increasing the bridge ; width. Recommendations are made for the data that should be collected and the number ; of bridges that should be represented in future studies. ; The Bridge Safety Index developed in this study i·s considerably better than all ; that have been proposed previously since it is based objectively upon accident rates ; and has a much better correlation with accident rates than any previously proposed ; Bridge Safety Index. Consistent use of this index in setting funding priorities for ; projects to improve bridge safety should result in a reduction of accident rates, ; property damage, injuries and fatalities at bridges.
  More +
• Format:
  PDF
• Funding:
  Study 2-18-78-233
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31414/dot_31414_DS1.pdf
• File Type:
  [PDF - 4.25 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:69ba674e101ae668f48009466748ff685557a252ba36887958d1520490da22fd