I was watching a rerun of Cash Cab today and I saw something I had noticed before- Ben Bailey was driving along and he entered a tunnel. In this case he was heading south (they usually show a map of his route) from the area around the Chrysler building to the area near Union Square.
I’ve only been to New York once, about 8 years ago. I am not too familiar with Manhattan but I thought the only tunnels were those leading to New Jersey or Brooklyn & Queens. So my question is this- what tunnels for vehicular traffic exist entirely in Manhattan?
I’m not talking about subway tunnels or access tunnels for maintenance of utilities or whatever. I’m talking about tunnels for street traffic- cars, taxis, etc. Do they go under buildings or other structures? Are they there to expedite the flow of traffic from one part of town to another (like a bypass), reducing the number of vehicles in a particular local area?
Thanks in advance.