What does beltway mean?

beltway meaning in Etymology Dictionary

term in U.S. for a ring highway around an urban area, specifically Interstate 495 around Washington, D.C., the Capital Beltway, completed 1964; from buckle (letter.) + method (n.). Figurative for "Washington, D.C., as well as its tradition" for much better or even worse, since c.1978.

beltway meaning in General Dictionary

a highway that encircles an urban location to ensure traffic does not have to go through the guts