Orbit I-405 speed limit in Washington
60 mphUsual limit
Mostly 60 mph: about 100% of I-405 in Washington is posted at 60.
How much of I-405 is at each limit
Open road
Mostly 60 mph
Through cities and towns
Mostly 60 mph
Questions
What is the speed limit on I-405 in Washington?
Mostly 60 mph: about 100% of I-405 in Washington is posted at 60.
What is the highest speed limit on I-405 in Washington?
60 mph, on 100% of its length in Washington.
Can the limit be lower than this?
Yes. Work zones, bad weather and local signs can set a lower limit. The posted sign is always the limit.
How does Orbit know the limit?
Orbit uses state and federal road data and OpenStreetMap, and drivers confirm limits from the road. In the app, the limit for the road you are on shows on the map and in CarPlay.
Posted limits as of October 2026, from state and federal road data and © OpenStreetMap contributors, measured by length of road. Work zones, weather and signs can set a lower limit; always follow the posted sign.
Other Interstates in Washington
I-405 in other states
Orbit shows the limit for the road you're on · coming soon to iPhone and CarPlaySee Orbit SI