The tunnels in (and under) Boston are likewise restricted--no propane allowed. This means I-90 and I-93 in the immediate city area are not usable routes.
jules6 wrote:
NO
Also there is no RV's allowed on any of the parkways in NY either.
There is at least one exception to this rule, the Lake Ontario State Parkway west of Rochester; but it's very much in the minority. It does have some comparatively low clearances, between 11' and 12' as I recall, so isn't suitable for all RVs, but if you fit it's legal and not white-knuckle driving (ignoring the quite rough, poorly maintained pavement).
Most or all of the parkways in Connecticut are also not suitable for (nor open to) RVs.