B4

B4 is a bus route in Brooklyn.

Description
It begins at Narrows Avenue and 77th Street, then turns right at 77th Street and continues until turning at 4th Avenue and turning right at Bay Ridge Parkway. It then goes the whole length until at Stilwell Avenue, when it turns onto the street and continues until it turns left at 86th Street and continues until it turns right onto Shell Road. It then continues until it turns left at Avenue Z and right at Ocean Parkway. It then continues on the street until it turns at Neptune Avenue and then it continues at Neptune Avenue and Emmons Avenue, and then it turns left on Sheepshead Bay Road and again at Shore Parkway. It turns right at East 16th Street and left onto Voorhies Avenue and then right again at East 14th Street. It turns right on Avenue Z and right on Ocean Avenue, and turns left onto Shore Road until it turns left onto Knapp Street and again at Shore Road. It turns right onto Bragg Street and again at Voorhies Avenue. It turns right onto Knapp Street, when it finally ends at Knapp Street and Harknees Avenue.

History
It began September 28, 1931 by Brooklyn-Manhattan Transit. The eastern terminus was Stillwell Avenue and 86th Street until 1978. The Emmons Avenue portion was the B21 bus until 1978. It then was extended to Sheepshead Bay in 1978, via Coney Island Hospital and along B36 and B21 routes. Off-peak service east of Coney Island Hospital was discontinued on June 27, 2010, but it was restored in January 2013. Service on Neptune Avenue was discontinued in 2010, but it was restored January 6, 2013.