Hey Rangerman - dunno what you are driving/towing, but do NOT go thru the heart of Boston in ANYTHING of any size! Shutting off propane won't cut it - NO propane allowed in tunnels - and the HC (Hazardous Carrier) route is atrocious! You have a pretty narrow window of opportunity to avoid horrendous Boston traffic on ANY of the routes on a Friday - if you are not past the greater Boston area by 2pm...well... you know the saying! When we run south from NH to the south shore areas I usually run 495. Road surface has been better - fewer potholes - and traffic a bit less. Expect HEAVY traffic heading north from Boston - they are all seeking an escape from there for the weekend up to Maine/NH/etc., too. As an example of what to encounter for traffic, last summer we left Bangor, ME headed to Clinton, CT on a Friday (NOT by choice...). This route didn't even include the immediate Boston area. Google estimated 5.5 hrs to cover the 350+/- miles - it took us an actual 8.5 hrs to go that distance! Welcome to the Northeast! I will add that we really enjoy Nickerson SP, and the coast of ME is wonderful! Just travelling between the 2 will be nerve-wracking! ST