In 1999, the think tank Reason Foundation proposed placing the Brooklyn–Queens Expressway within Brooklyn Heights in a tunnel. However, the NYCDOT did not seriously consider this suggestion until 2016, when it studied six possible tunnel configurations. The NYCDOT found that only the tunnel option starting at 21st Street on Third Avenue and ending near Kent Avenue in Williamsburg would be feasible. This option would have served as a bypass, with vehicles heading to Downtown Brooklyn, or the Manhattan and Williamsburg Bridges using the triple cantilever structure, which would be tolled.