Regular driving in large working cities is usually only done out of professional necesscity and people who drive for a living tend to be in lower socioeconomic bands.
How many people on Wallstreet do you know that drive to work?
I'm not so confident in that first claim, and my anecdotal evidence doesn't support your theory.
However you did mention some other studies on this thread that support your claim this is a regressive tax, I'm worried I missed them, can you share the links?
> How many people on Wallstreet do you know that drive to work?
A lot. Also white-shoe lawyers. They live in Greenwich, Westchester or Westport and drive into the city. (And still, they often park uptown because driving in the congestion zone is annoying and expensive.)
The poor in New York don't drive. If they do, they do so to earn an income. Less congestion helps with that.