The Highway Safety Information System (HSIS), established in 1987, is a foundational highway research data system. The State of Maine has participated in the HSIS program since the 1987, providing quality data to HSIS for use by researchers through a request system. In 2021, HSIS began a modernization effort with the goal of expanding the technological and analytic capabilities of the data system. This modernization provides an increased emphasis on spatial analysis and cloud-based data management.

What Has Changed

This guidebook is intended to support the use of Maine HSIS data for the years 2016 and beyond. Data and documentation prior to 2016 (1987-2015) are available upon request to the HSIS Virtual Laboratory. Prior to 2016, the Maine datasets included variables for the following files:
 

1. Roadway inventory (i.e., Links).
2. Traffic data.
3. Interchange characteristics.
4. Accident characteristics.
5. Vehicles involved in crashes.
6. Vehicle occupants involved in crashes.

The revised Maine database incorporated into HSIS contains seven different files:
 

1. Roadway inventory (including traffic information).
2. Intersection node inventory.
3. Interchange inventory.
4. Crash characteristics.
5. Units involved in crashes.
6. Commercial vehicle information.
7. Persons involved in the crash.