I was once riding in a cab, ranting about how private cars should be banned in NYC, and the driver spoke up and said that no one who drives in the city wants to drive there—they do it because they have to. They do it because many neighbors within the greater metro area aren’t severed by any form of public transportation.
I'd be interested to see numbers on that (e.g. what percentage of cars are coming from which locations). There are people poorly served by transit, but Manhattan also has a lot of fairly wealthy people driving, or even being chauffeured, on routes that have perfectly usable transit that they'd just rather not use. Car ownership in NYC (45% overall) is much higher among wealthier than poorer people, and especially so…
People that own cars in Manhattan use them to escape on the weekends...not drive around during the week