AASHTO HSM-1, Highway Safety Manual, 1st Edition (2010), provides analytical tools for considering safety in the roadway project development process. Foundational chapters cover introduction and overview, human factors, and fundamentals of crash frequency and severity. Chapters 4 through 9 present the safety management process, covering network screening, diagnosis, countermeasure selection, economic appraisal, project prioritization, and safety effectiveness evaluation. Chapters 10 through 12 provide predictive methods for rural two-lane two-way roads, rural multilane highways, and urban and suburban arterials. Chapters 13 through 17 address roadway segments, intersections, interchanges, special facilities and geometric situations, and road networks. Practitioners in highway agencies can apply the manual to select countermeasures, compare alternatives, and quantify and predict the safety performance of roadway elements considered in project development.