"Back East" -- anywhere in the US that isn't California

"Freeway" -- any road with on and off ramps and no traffic lights or cross streets. What might be called an Expressway elsewhere (but always backed up so they aren't express) or a tollroad or a highway.

"The" -- numbered freeways take an article...as in "The five" or "the 91."

"Have a good one" -- this is used in place of "thank you" in retail establishments (along with "no problem" which equals "you're welome.") I always wonder what I am to have good. Good day, good life, good afternoon?