Agencies can use state-of-the-practice safety analysis tools—such as the Highway Safety Manual—to help identify sites where the frequency of crashes could be reduced by implementing a safety countermeasure. These tools can help agencies get the biggest bang for their dollar. Learn more about the Highway Safety Manual, Crash Modification Factors, Safety Performance Functions, the Interactive Highway Safety Design Model, the Systemic Safety Project Selection Tool, and other data analysis resources and tools.

Guidance

• FHWA Guidance
• MAP-21 Guidance on State Safety Data Systems

Tools

• Safety Data Technical Assistance
• Highway Safety Information System (HSIS)
• The Highway Safety Manual (HSM)
• Highway Safety Manual (HSM) resource page
• Highway Safety Manual (HSM) Implementation
• Crash Modification Factors Clearinghouse
• AASHTOWare Safety Analyst™
• Interactive Highway Safety Design Model
• Safety Data Dashboards

Reports

• Desktop Reference for Crash Reduction Factors 
• Perspectives for the Development of the Roadway Safety Data Program
• Safety Performance Function Development Guide: Developing Jurisdiction-Specific SPFs
• Safety Performance Function Decision Guide: SPF Calibration versus SPF Development
• NCHRP 20-7(332) User's Guide to Develop Highway Safety Manual Safety Performance Function Calibration Factors
• United States Roadway Safety Data Capabilities Assessment
• Crash Modifications in Practice
• A Guide to Developing Quality Crash Modification Factors
• A Systemic Approach to Safety - Using Risk to Drive Action

HSM

The Highway Safety Manual (HSM) offers a new generation of tools that help state and local highway agencies incorporate explicit, quantitative consideration of safety into their planning and project development decision making.