The Highway Safety Manual (HSM) is a publication of the American Association of State Highway Transportation Officials.
It contains concepts, guidelines, and computational procedures for predicting the safety performance of various highway facilities.
[1] The HSM was published in 2010 and is divided into four sections: Highway Capacity Manual Transportation Research Board American Association of State Highway and Transportation Officials FHWA Office of Safety Highway Safety Manual page https://safety.fhwa.dot.gov/hsm/ Crash Modification Factor Clearing House http://www.cmfclearinghouse.org/
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