A recent study of mode share (the % share of transportation trips by car, transit, walking, biking etc) relative to city size and income levels in almost 800 cities in 61 countries.
Data corresponding to 794 cities, with a combined population of almost 850 million people, is used to model the vast heterogeneities in the way people move in cities.
Some urban areas rely heavily on cars, with less than 10% of their journeys on alternative modes of transport (either walking, cycling or Public Transport), whilst in other cities, less than one in four journeys are by car. Among the 794 cities, 22.4% of the journeys are Active mobility, 26.2% are Public Transport, and 51.4% are by Car.
https://www.sciencedirect.com/science/article/pii/S0160412024001272
20% of people employed in NYC don’t live there. So that explains ~940,000 people who are probably driving.
13,000 vehicles in NYC are taxis. 77,000 active ride share drivers. These are used by the 176,000 daily tourists.
That brings the total number of cars in NYC largely serving people who don’t actually live there to 1.1m most days.
There are 2.1 million registered cars in NYC. That means 1:3 cars currently in the city represent people who don’t live there. That is roughly 1/3 of all cars in NYC. Likely closer to 50% or more of the actual traffic since the average NYC resident does not drive their car every day.