Crash Reduction Factors for Traffic Engineering and Intelligent Transportation System (ITS) Improvements: State-of-Knowledge Report

This digest provides interim results from NCHRP Project 17-25, "Crash Reduction Factors for Traffic Engineering and ITS Improvements." The digest summarizes the current status of crash reduction factors for a variety of treatments, provides a summary of the "best available" crash reduction factors, and discusses the relationship between this study and other ongoing research studies that are either documenting or developing additional factors.