Engineering & standards

Environmental guidance

Resources for environmental and transportation professionals, organized by discipline.

Construction

Find information on construction materials and construction guidance.

Transportation System Management and Operations - TSMO

Learn about Transportation Systems Management and Operations (TSMO) and how it is changing how we manage transportation infrastructure.

Slow down – lives are on the line. 

In 2023, speeding continued to be a top reason for work zone crashes.

Even one life lost is too many.

Fatal work zone crashes doubled in 2023 - Washington had 10 fatal work zone crashes on state roads.

It's in EVERYONE’S best interest.

95% of people hurt in work zones are drivers, their passengers or passing pedestrians, not just our road crews.