The traditional approach to safety is to identify “hotspot” locations, where a high concentration of crashes occur, then identify and implement measures to reduce the number of crashes occurring at that location.
ODOT typically uses the
Safety Priority Index System to identify potential hotspot problems on the state highway system.
SPIS is a flagging tool that compares the number of crashes on the entire roadway network across Oregon, including city streets, county roads and state highways.
It generates two annual reports -- on-state highway and off-state highway -- listing public roadway segments with a calculated SPIS score.
The SPIS score is based on crash rate, frequency and severity over the prior three calendar years. The higher the SPIS score, the higher the potential safety need for the identified roadway segment.
SPIS can be used to identify roadway segments that can benefit from potential safety improvements.