Data Analysis
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.
- Desktop Reference for Crash Reduction FactorsÂ
- Perspectives for the Development of the Roadway Safety Data Program Perspectives for the Development of the Roadway Safety Data Program This document follows the state data capability assessment process and summarizes the project team's and State participants' perspectives, organized into four areas: data collection, data analysis, data management, and data expansion. For each goal area and proposed action item the document includes discussion on motivation, priority, delivery methods, and recommendations.
- Safety Performance Function Development Guide: Developing Jurisdiction-Specific SPFs Safety Performance Function Development Guide: Developing Jurisdiction-Specific SPFs The SPF Development guide is intended to provide guidance on developing safety performance functions (SPFs) from the Highway Safety Manual (HSM) (AASHTO, 2010). The guide discusses the process to develop jurisdiction specific SPFs. It is intended to be of use to practitioners at state and local agencies and to researchers.
- Safety Performance Function Decision Guide: SPF Calibration versus SPF Development Safety Performance Function Decision Guide: SPF Calibration versus SPF Development This SPF Decision Guide is intended to provide guidance on whether an agency should calibrate the safety performance functions (SPFs) from the Highway Safety Manual (HSM) (AASHTO, 2010) or develop jurisdiction-specific SPFs. The guide discusses the factors that need to be considered while making the decision. It is intended to be of use to practitioners at state and local agencies and to researchers.
- NCHRP 20-7(332) User's Guide to Develop Highway Safety Manual Safety Performance Function Calibration Factors NCHRP 20-7(332) User's Guide to Develop Highway Safety Manual Safety Performance Function Calibration Factors This Guide is focused on the predictive method found in Part C of the HSM (2010). The predictive method is used to estimate the expected average crash frequency of an individual site. This Guide supports the procedure for the development of calibration factors for HSM (2010) SPFs for rural two-lane, two-way roads (HSM Chapter 10); rural multilane highways (HSM Chapter 11); and urban and suburban arterials (HSM Chapter 12).
- United States Roadway Safety Data Capabilities Assessment
United States Roadway Safety Data Capabilities Assessment FHWA Office of Safety initiated the Roadway Safety
Data Capability Assessment to better understand the current status of State safety data systems
- Crash Modifications
in Practice Crash Modifications
in Practice The CMFs in Practice Series includes five separate guides that identify opportunities
to consider and quantify safety in specific activities, including roadway safety management
processes, road safety audits, design decisions and exceptions, development and analysis of
alternatives and value engineering. The purpose of the CMFs in Practice series is to demonstrate
practical application of CMFs.
- A
Guide to Developing Quality Crash Modification Factors
A Guide to Developing Quality Crash Modification Factors The purpose of this guide is
to provide direction to agencies interested in developing crash modification factors (CMFs).
Specifically, this guide discusses the process for selecting an appropriate evaluation methodology
and the many issues and data considerations related to various methodologies.
- A Systemic Approach to Safety
- Using Risk to Drive Action A Systemic
Approach to Safety - Using Risk to Drive Action The systemic approach to safety involves
widely implemented improvements based on high-risk roadway features correlated with specific
severe crash types. The approach helps agencies broaden their traffic safety efforts and consider
risk as well as crash history when identifying where to make low cost safety improvement locations.
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.