Summary from: Roadway Safety Data Program | New Hampshire Department of Transportation Safety Data Systems and Processes | FHWA-SA-15-058

Background

The purpose of this case study is to highlight noteworthy practices of the New Hampshire Department of Transportation (NHDOT) in leveraging technology to enhance safety data management—in particular, NHDOT’s use of an integrated Linear Referencing System (LRS) and use of information technology (IT) tools to analyze safety data (e.g., AASHTOWare Safety Analyst™, American Association of State and Highway Officials (AASHTO) Highway Safety Manual (HSM), and Graphical Information Systems (GIS) tools). New Hampshire’s use of technology improves management of safety data systems by providing mechanisms for:

• Electronic data collection, thereby reducing data errors at the point of collection;
• Integration of data from different systems, using GIS and a consolidated LRS;
• Access to multiple types of safety data through a single portal that extracts and displays crash, traffic, and road inventory data; and
• Analysis of data for identification of high crash “hot spots,” or locations with potential for safety improvement, using safety performance functions to estimate expected crash frequency of all sites across the road network.

Read the Case Study New Hampshire Department of Transportation Safety Data Systems and Processes for more detailed information.