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FHWA Home / Safety / Scale and Scope of Safety Assessment Methods in the Project Development Process

Scale and Scope of Safety Assessment Methods in the Project Development Process

Long Description

The predicted number of total segment-related crashes at divided urban multi-lane arterials equals the sum of number of multiple-vehicle non-driveway collisions and the number of single vehicle related crashes and the number of multiple vehicle driveway-related collisions (HSM Equation 12-4, p 12-5):

Multiple-vehicle non-driveway collisions calculated as:

Total Crashes calculated as:

N-prime value for fatal plus injury crashes calculated as:

N-prime value for property damage only crashes calculated as:

Fatal plus injury crashes calculated as:

Property damage only crashes calculated as:

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Page last modified on November 18, 2016
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