Design hour report

Get a list of the year’s 200-highest traffic hours and associated vehicle volumes from our network of traffic recorders permanently installed in Washington State highways. This report helps project designers, planners and traffic engineers estimate the volume of traffic used in the design process.

1,557 work zone-related crashes

were recorded on state highways in 2025.

542 people were injured

in 2025 due to work zone-related crashes. 

29% increase in fatality collisions

in work zones from 2024 to 2025.