Central Massachusetts: I don’t know, 1/10? Almost no infrastructure. A neighboring town (Holden) recently redid their Main Street and provided a bike lane, which is quite useful to me as a biker, but that is a huge exception to the rule. And, frankly, there’s very little courtesy from the drivers in rural Massachusetts, particularly on the more heavily-traveled roads.
The very lucky thing for me is that most local streets are not badly congested as they are in other parts of the state/country. And, the saving grace (for me) is that I have rail trail access a little over a mile from my house that is actually useful to me for both exercise (when not entirely iced over, that is) and for access to two of the neighboring towns that I need to go to frequently.