You have a bit of a chicken and egg problem here: Nobody wants to invest in public transport because everybody is driving by car, while nobody wants to use public transport, because it is shit. Increasing the lobby for better public transport by making it harder to drive could be useful there, assuming you make the state take care of the problem cases during the transition (here in Europe some countries cover costs of taxi fare for kids who can’t reach school within a reasonable time by public transit, for example)