Sonic just opened on RT1 in Danvers, MA, haven't been there yet but it is always busy, even at midnight on Wednesdays! If one were drving from Winni to CT, you could go down 95 and get off/on RT1 and hit Sonic en route, sure a bit extra travel but it's an option.
ERICP........Sonic opened up there new store on rt.#1 North in Peabody,Ma