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HSM Implementation Guide for Managers. Table of Contents. Executive Summary · 1. Introduction to the Highway Safety Manual · Purpose of the Implementation The Highway Safety Manual (HSM) (2010), 1st Edition, was published by American Association of State Highway and. Transportation Officials (AASHTO) in 2010. FHWA has developed supporting implementation tools including the Interactive Highway Safety Design Model (IHSDM), the Crash Modification Factors (CMF) State Initiative for Implementing the Highway Safety Manual identified a need to encourage broader use of the HSM. They determined that a user guide focused The AASHTO Highway Safety Manual describes the Roadway Safety Management Process with Network Screening as the foundational step to assess geographic areas The Highway Safety Manual (HSM) is a resource that provides safety knowledge Evaluate the crash reduction benefits of implemented treatments;. To implement this policy, the transportation analyst is encouraged to use the Highway. Safety Manual (HSM) methods, where applicable, to measure safety