I bet on any day in NYC there are thousands of empty parking spots available. You simply have go to a parking garage to pay for them. And most people consider that a last resort.

The simple solution is to push as many cars from the street curbs to the private or municipal garages to free up curbside space for truck deliveries, taxi pick-up and drop-off and buses.

I was impressed (as a visitor from London, where we have lots of measures, rapacious parking enforcement, but lots of 'sound and fury, signifying nothing')

by the Manhattan parking signs (on the street), which said (from memory):

'we don't ticket.  We tow'.

This is surely the way to keep traffic moving-- a credible deterrent which is enforced.  A very New York solution: blunt and to the point.

(we use surveillance cameras to enforce bus lanes, now).

Eventually I think you will move to a London-like congestion charge (£10 ie $18 to drive into the central zone 7am to 7pm Monday to Friday).  However I expect your civil libertarians will fight harder than ours.

I was stunned by the number of SUVs on New York streets, each taking up almost 2 car lengths or parking spaces.  I mean, you expect that in Texas or Wyoming, but in New York City?  Where do these people drive these things?  Where do they park them?  What do they carry in them?  (this ain't soccer moms, in the middle of Manhattan).

Our mayor is considering special charges for longer vehicles (he hates SUVs, but as a former Trotskyite, Red Ken is partly a class warfare thing: the London SUV is normally a Range Rover/ Porsche Cayenne/ Toyota Landcruiser driven by some rich hedge fund manager (or his spouse) with more money than brains, and a need to extend the length of his proboscis... Jared Diamonds 'The Third Chimpanzee' comes readily to mind).