Details:

Creators:
Gandhi, R. B. V. ; Lytton, Robert L.
Gandhi, R. B. V. ; Lytton, Robert L. Less -
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:

Supporting Files

• No Additional Files

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