interstate 75 passes through from macon to the south, and from chattanooga to the north. interstate 575 is a spur which merges with i‑75 near kennesaw. i‑575 serves northeast portions of cobb county and a large portion of cherokee county. it ends in ball ground. interstate 675 is a route which connects i‑75 in henry county to i‑285 in southern dekalb county. most of the corridor is within clayton county.