Regional High Injury Network


High injury networks (HINs) include stretches of roadways where the highest concentrations of collisions occur on the transportation network. An HIN is intended to show where fatal and serious collisions are occurring in the region. An HIN, however, is not an assessment of whether a street or location is dangerous. Rather, an HIN suggests which corridors within a transportation network carry a higher risk of injury. When developing an HIN, jurisdictions typically want to identify a subset of the network where the most collisions are occurring (>50%). Developing an HIN can prove helpful for a variety of reasons, including:

  • Identifying areas of need;
  • Providing agency staff with more information on where they can focus limited resources;
  • Providing opportunities to understand how communities of concern or disadvantaged communities are impacted by higher rates of collision and serious injury; and
  • Assisting with building greater public and political support.

In 2018 SCAG developed its first regional HIN. In developing the HIN, SCAG reviewed HIN methodologies for a variety of jurisdictions including Los Angeles, San Francisco, Portland, and Portland Metro. SCAG borrowed elements from their approaches to develop one that could work for the entire region. To learn more about SCAG’s regional High Injury Network, click here.