It is anticipated that the second edition of the HSM (or HSM2) will expand upon the methodologies in the first edition of the HSM, incorporate new models and research that has been completed, and modify practices based on user experiences and needs. New or additional content is expected to be included in the areas of human factors, bicycle and pedestrian safety, systemic safety, SPF calibration, additional crash prediction models, and CMF development. It is the responsibility of the users of the manual to incorporate any relevant information when the HSM2 becomes publicly available. Additional information about the HSM2 is available on the AASHTO website related to the HSM. A link to the website can be found in

Appendix F, Section 3 – External References (Reference 4)

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