Here in CA, the law is "slower traffic move right". If someone is coming up on your tail, you are obliged to move over, though I've never seen anyone ticketed for blocking the flow of traffic. Personally, I drive in the right lane with the semis, where I get there just about as fast but also where I feel safer. I am very concerned with all the idiots with gun driving around shooting anyone who they think is in their way. It's not about going fast, but about watching your rear view and moving right, and living longer. Of course, I sometimes jump into the diamond lane and go 90, but not for very long. Makes my wifey nervous, and you know, a happy wife makes a happy life.