Prospect Expressway

The Prospect Expressway is a sunken six-lane freeway that runs between the Gowanus Expressway and Ocean Parkway. It is desingated NY 27.

Description
The Prospect Expressway begins at exit 24 of I-278 (the Gowanus Expressway) in the borough of Brooklyn in New York City. For the first stretch through Brooklyn, it is a sunken six-lane freeway through the Park Slope and Windsor Terrace neighborhoods — providing interchanges with Fourth Avenue, Seventh Avenue, and 11th Avenue. At exit 5, eastbound NY 27 leaves the Prospect Expressway, which then interchanges with Ocean and Fort Hamilton Parkways before ending a short distance to the south at exit 6 and Church Avenue. The freeway ends at Church Avenue, where it continues as Ocean Parkway.

History
The parkway was built in the 1950s and opened in 1960, but wasn't complete yet. Prior to 1970, NY 27A ran on the route to the Brooklyn-Battery Tunnel. The route was then cut back to its current terminus, and it then became an extension of NY 27.

Transportation
The B103 bus runs on the expressway between Fourth Avenue and the exit to Tenth Avenue. The BM1, BM2, BM3 and BM4 express buses run between the start of the expressway to the end of the expressway.