Accident Analysis of Highway Narrow Bridge Sites: Volume II – Technical Documentation
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1983-02-01
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Edition:Final Report
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Abstract:This research was conducted to determine (1) the extent of the accident problem associated with narrow bridge sites, (2) the relationships between frequency and severity of accidents to the design, geometry, and condition of the bridges and their approaches, and (3) characteristics of accidents at bridge sites. Environmental and accident data at bridge sites were studied from five States (Arizona, Michigan, Montana, Texas, and Washington). Sources of data consisted of FHWA bridge inventory and accident files, State photologs and computerized and manual files, and site visits. Also, 125 accidents involving collisions with bridge ends, railings, and transition treatments were investigated in depth. The POPULATION file (11,880 bridges) was used to determine the extent of the narrow bridge accident problem and the associated accident frequencies, rates, and distributions. The SAMPLE file (1,989 bridges selected from the POPULATION file for in-depth study) was used to determine the relationships of various physical and traffic characteristics to accident rates and severities. The ACCIDENT file (124 investigated accidents) was used to determine the characteristics and the relationships between accident and injury severity for accidents at bridge sites.
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