Driving Trucks in Seattle

Planning a trip into Seattle? Continue reading to make sure you do so safely and legally.

Over-legal Vehicles

Vehicles and loads that exceed the maximum height, weight, width, and length, specified by state law are required to get an Over Legal Trucks Permit to operate in the city.

Heavy Haul Permits

Working with the Port of Seattle, we've made it easier and more convenient to permit and inspect overweight vehicles operating in and out of Seattle's Heavy Haul Network (HHN Map) or along any of these city streets. This partnership, also known as The Northwest Seaport Alliance, helps reduce congestion around the ports and makes it easier to do business and remain competitive. Learn more about Heavy Haul Network Permits.

Bridge Vehicle Weight and Height Restrictions

Look for posted signs on bridges with weight restrictions, as well as on the Alaskan Way Viaduct (State Route - SR 99) and its downtown Seattle ramps. It is a driver's responsibility to verify bridge heights along planned routes. Not doing so can cause vehicles to get stuck and traffic congestion.

Hazardous Materials Restrictions

Posted signs remind truck drivers that hazardous materials are always restricted in the SR 99 Battery Street Tunnel and on the Alaskan Way Viaduct during weekday the peak travel periods of 7:00 and 9:00AM and 4:00 to 6:00PM.

Overnight Parking 

The Port of Seattle has terminal space to accommodate overnight drayage truck parking. View the Free Overnight Drayage Truck Parking flyer.

Spokane Street Corridor Truck Routing

Use the map in the Free Overnight Drayage Truck Parking flyer if traveling on the Spokane St corridor. It's printed in five languages (English, Punjab, Amharic, Spanish and Russian and can help drivers avoid congestion and construction disruption.


Greg Spotts, Director
Address: 700 5th Ave, Suite 3800, Seattle, WA, 98104
Mailing Address: PO Box 34996, Seattle, WA, 98124-4996
Phone: (206) 684-7623

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The Seattle Department of Transportation (SDOT) is on a mission to deliver a transportation system that provides safe and affordable access to places and opportunities for everyone as we work to achieve our vision of Seattle as a thriving, equitable community powered by dependable transportation.