Thousands of people will be trying to beat one another to the freeways - and the traffic will get worse as the day wears on.
The good news is that the state Department of Transportation will shut down most major road construction projects by noon Friday.
The bad news is that if you are not on the road out of town by about 10 a.m., you're going to be looking at brake lights.
According to the state DOT, the slowest times on eastbound Interstate 90 start at 10 a.m. and last through 6 p.m.
Heading south on Interstate 5 from Tacoma, those back-ups are expected to start at 9 a.m. Friday.
As for catching a ferry, the heaviest terminal congestion is expected from 3 to 7 p.m. Friday.
Even those who stay in the immediate Seattle area won't catch a break.
Big backups from the Bumbershoot Festival at Seattle Center are expected. Add to that the big gamers' convention in downtown Seattle on Friday through Monday.
And there are Mariners games Friday, Saturday and Sunday, too.