After passing rest areas on either side, I-390 reaches the NY 408 exit adjacent to the American Rock Salt mine at Hampton Corners. Here, most traffic bound for the Buffalo area exits to go west to Mount Morris, visible across the flats from the freeway, where it follows NY 36 north. To the immediate east of the exit Route 408 ends at Route 63, which carries traffic from the interstate into Geneseo, the county seat. A mile north of the exit, Canaseraga Creek drains into the Genesee River on the road's west side.