I-90 crosses Lake Washington on a floating bridge. I have driven over it countless times. It crosses from Seattle to Mercer Island which the freeway then crosses before continuing on to the east side. I was on that side of the plane when taking off from SeaTac and got a great view of the bridge. The dead straight floating section and the transition to land looked very interesting from above. The road actually goes through a tunnel on Mercer Island in a long curve which, when I imagined its path, only added to the geometry of the whole.