It would be really weird and not much fun, but faster and safer than surface streets. I'd do it but I wouldn't enjoy it all that much. Now if they allowed a few slow moving buses and trucks for bikes to draft, that would be fun. They could have some specific areas for them to slow down to allow cyclists to tuck in behind and then speed up to 50mph. I could get to work in 20 minutes! Imagine slingshotting out from behind the truck onto your off ramp at 50mph, weeeeeeeee!