Actually, most travel in Vauban is by bicycle, not transit. It is a deliberately planned and purpose-built "town for carfree people" rather than a carfree town. So it seems to be close to what the OP dreamed about. Households with cars must rent parking space in structures on the edge of town, at a cost of €17,500. Cars are permitted on a couple streets, but are limited to walking speed and must yield to other users.
Originally Posted by I-Like-To-Bike
Here's the conclusion of a short article about Vauban that has more info than the Wikipedia article:
"Vauban is a success story, with greatly reduced car ownership and bicycle substitution of routine car trips. Key to this is decoupled parking, meaning both car ownership and habitual use are no longer default scenarios: 70% of the households do not have a car, and 41% of car-owners use a bicycle more than they did before moving. The second vital component is the ease with which people can go about their lives without a car, made possible through the provision of local services and jobs, proximity to the city center, extensive infrastructure for walking and cycling and good, low-cost regional transit services. In these circumstances developments such as Vauban can attract people not pre-disposed to an altruistic car-free lifestyle: 57% of residents in car-free households gave up their car when they moved to Vauban."
Car-free city Vauban
BTW, the plan for the entire EU (minus the UK) is for every city to be carfree by 2050.