Traffic safety methods

Find details about the methods we use to keep travelers safe, including roundabouts, road equipment and striping, and workzone safety information.

Learn about collector/distributors and how they improve traffic flow on freeways.

Learn about diverging diamond interchanges, a proven way to move more people and reduce the potential for collisions.

Learn about roundabouts, including how to travel through them as a pedestrian, cyclist or driver.

Learn about how we use rumble strips to keep vehicles on the roadway and reduce the frequency of collisions.

Basic information about annual roadway re-striping work, and how you can help.

Find important information about traveling in and around roadway work zones, including information on traffic control training and certifications.

8,683 animals crossed the Snoqualmie Pass East Project area

as recorded by WSDOT and partners in 2020 and 2021.

46% increase in Amtrak Cascades ridership to 251,000 passengers

in 2021 compared to 172,000 in 2020.

Nine wetland and stream mitigation sites across 32.7 acres added

to our monitoring program in 2021 to help offset climate change impacts.