Operations & services

Learn about the tools we use to reduce traffic congestion and collisions, including ramp meters, traffic management centers, traffic signals and our incident response team.

Active Traffic and Demand Management

Learn about Active Traffic and Demand Management (ATDM), an operational strategy for reducing collisions associated with congestion and blocked lanes.

Avalanche control

Learn about our avalanche forecasting and control efforts to keep our transportation system reliable and safe. 

Incident Response Program

The Incident Response program is a traffic congestion mitigation strategy. The Incident Response Team (IRT) is composed of agencies, vendors, and other resources that respond to, investigate, clean up, and clear traffic incidents.

Ramp meters

Learn about ramp meters and how they work.

Snow and ice plan

Learn about how we prepare and prioritize our response to winter weather driving conditions.

Tire chain installation

WSDOT issues permits allowing businesses and individuals to install and remove motorist-owned tire chains

Traffic Management Centers (TMCs)

Learn about the central command centers for WSDOT's highway monitoring and response efforts.

Traffic signals

Learn more about how traffic signals operate, and how and when they are installed.

Performance highlights from the Gray Notebook

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.