A minimum of two through lanes in each direction are maintained for traffic on Grand Concourse to facilitate roadway work by NYCDOT Bridges. Motorists should expect delays and consider alternate routes. The East 161st Street underpass reopened between River Avenue and Sheridan Avenue on April 1st 2007. The outer roadways on East 161st Street will accommodate traffic. Also no left turns from East 161st Street onto the Grand Concourse are permitted. Motorists should follow posted detour for access onto the Grand Concourse. Note: As of April 3 until November 3, 2007 the westbound surface roadway of East 161st Street is closed between Sheridan Avenue and Gerard Avenue for roadway reconstruction.