> Even in Paris, something like a third of all commuters drive a personal car.
See [1]: to get to their work place, 72% of Parisians and 75% of Franciliens (residents of Ile-de-France, excluding Paris) use public transit. It's at most 1/4 using a car (number not quoted in the study). The "a third" number is quoted for people going from Paris to suburbs during the week by car (which I think includes off-peak trips)
> Out of those who ride public transit, many if not most would prefer to drive, they just can’t afford it
Sorry but that's just an opinion. I'm not aware on a study of that, but I and a lot of people I know would rather not drive. Driving in Paris is a terrible, slow and costly experience.
[1] https://www.insee.fr/fr/statistiques/fichier/1293788/alap368...