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:
  Bridge Safety Index Funding Priorities Highway Safety Narrow Bridges Traffic Safety
• 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.
  
  
• Format:
  PDF
• Funding:
  Study 2-18-78-233
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:69ba674e101ae668f48009466748ff685557a252ba36887958d1520490da22fd
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31414/dot_31414_DS1.pdf
• File Type:
  [PDF - 4.25 MB ]