These cameras in particular would not be any good for that. They're usually mounted super high up and very low resolution, at 0.5FPS, and they are in such high

These cameras in particular would not be any good for that. They're usually mounted super high up and very low resolution, at 0.5FPS, and they are in such high traffic locations that bumper to bumper traffic would just obscure the plates of the cars in front and behind. You can see the data feeds here, actually. https://webcams.nyctmc.org/map https://webcams.nyctmc.org/map. You can hardly make out anything.