So make it punitively expensive to drive. Any tax leveed would go towards transit.
You're really giving me this vibe:
We would agree on not orienting development towards cars; and for that matter on tolls, and other measures as well.
But it's important to step back for a moment.
IF these development incorporate substantial parking; then it's entirely possible traffic will get worse; in the still mostly fossil fuel burning age, the resulting pollution is something all residents, including pedestrians, transit users and cyclists breathe.
It's also a legitimate point that it may impede the movement of some surface transit.
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I think; IF some form of development goes ahead here, these sites really need to be parking-free.
That will dictate that the vast majority of prospective residents will not own cars/drive; the few who do will either use carsharing, or reserve a spot off-site, for periodic use.
It's much more practical to limit the desire to drive at the design stage than try to shift behaviour once owners/tenants who drive move in to the area.
In the event parking is tolerated in this development, and it goes ahead, which I would see a mistake; then it is legitimate to talk about how to manage the resulting traffic, not for the reason of being benevolent to drivers, but
to minimize the adverse impact on all road users (drivers/pedestrians/cyclists/transit/delivery vehicles etc.).
Poorly thought out design that induces congestion serves no one well.