I5 in WA is about 275 miles long, but I'm guessing you're looking at Seattle or Tacoma. If public transportation is available, look at it. Spending that time reading or sleeping isn't horrible.

WSDOT has a good website and tons of information about whatever projects are going on. They're also pretty responsive on Twitter and Facebook, but you have to do some reading work first, they get zillions of "how do I make my life better" posts, but they tend to answer specific questions.