(a) Route 27. Route 27 (Sunrise Highway Extension) between Brookhaven-Southampton town line and terminus of Sunrise Highway Extension at Route 27/CR 39 in the Town of Southampton.

(b) Route 27/CR 29. Route 27/CR 39 between Route 27 at terminus of Sunrise Highway Extension and Route 27 (Montauk Highway).

(c) Route 2. Route 27 (Montauk Highway) between Route 27/CR 39 and Caldor Store, Bridgehampton.