wait for it... wait for it.... A 6 lane bridge. Hahahahahahahaha!! http://www.columbian.com/news/2010/jan/26/portland-flexes-muscle-i-5-bridge-debate/
Well with increased taxes in Oregon, people would think about fleeing across the river to Washington to take advantage of their state tax system. So Oregon smartly makes it a big pain in the ass to commute in hopes of discouraging people from relocating to the couv.