During construction, at least four lanes of Second Avenue remained open to traffic and efforts were made to maintain access to businesses and residences. Structural and ground improvement techniques were used to minimize ground settlement and to preserve the structural integrity of various facilities, including utility lines, buildings, tunnels, and ramps. Public tours were held to inform residents of the project's progress.
In subsequent phases of the project, the line will be extended south to Lower Manhattan and north to 125th Street.
