Massachusetts doesn't do a heck of a lot right, but they got the bike laws right. (My opinion. Your mileage may vary.) The law clear states that bicycles may use all public ways, except for divided express highways that have been posted by the department of public works.

A few years back, some whiners in la-de-da Concord wanted bikes banned from certain roads. Apparently, they didn't like having to slow down in their over-priced SUV's. (intentional dig there) They hit a dead end when they were told what the law is. Bear in mind, Concord has always been a very popular place for cyclists, with its decent roads, New England postcard scenery, and lack of beer joints and shopping malls. But, the attitude toward cyclists started changing, I'd say about ten years ago. Using the political power that the affluent can buy, they kept the minuteman bikeway from being extended past Bedford to Concord, which was the original plan.

Sorry, didn't mean to get off on a rant there. Carry on. Feel sorry for cyclists in MO. They are in for what will probably be a tough fight.