TRB's National Cooperative Highway Research Program (NCHRP) Report 617: Accident Modification Factors for Traffic Engineering and ITS Improvements explores the development of accident modification factors (AMFs) for traffic engineering and intelligent transportation system improvements. AMFs, also known as crash reduction factors, are designed to provide a simple and quick way of estimating the safety impacts of various types of engineering improvements, encompassing the areas of signing, alignment, channelization, and other traffic engineering solutions.
The following appendices to NCHRP Report 617 are available online:
Two AMF treatment summaries that appear in the printed version of NCHRP Report 617 contain incorrect information. These treatments are "Add Intersection Lighting" and "Add Roadway Segment Lighting." The information in these two AMF treatment summaries has been corrected in the online version of the report.
Table of Contents
|Project Objective and Overview||5-7|
|Organization of Report||8-8|
|Extracting Information on Existing AMFs and Determining AMF Quality||9-10|
|Prioritizing Phase II Efforts to Develop Additional AMFs||11-16|
|Installation of a Rural Traffic Signal||19-20|
|Increasing Pavement Friction on Roadway Segments and at Intersection Approaches||22-23|
|Signalized Intersection Treatments in Urban Areas||24-25|
|Speed Change and Crashes||26-26|
|Effect of Median Width||27-29|
|Chapter 6 - Conclusions||68-69|
|Abbreviations used without definitions in TRB publications||75-75|