With that said, let me just say that the shoulders on most freeways are easily twice the width of a bike lane, and permit you to get much further away from traffic than you normally can, particularly compared to rural roads where there IS no shoulder or bike lane. Additionally, I think freeway shoulders would have far LESS road debris PER MILE than I normally have to dodge when I ride in town. Between loose gravel, broken beer bottles, trash, and storm drains, I sometimes spend more time outside the bike lane than in it.

Physics definitely says this is a bad idea, but you should realize that a freeway shoulder can be quite attractive to cyclists, rather than the opposite.