I don't want a life without a car within the constraints of the current options for going car-free within the US-- mainly living in a large high density city, a

I don't want a life without a car within the constraints of the current options for going car-free within the US-- mainly living in a large high density city, and still having to contend with vehicular traffic and pollution. But, I strongly desire life without a car. If there was a 50K population max car-free walkable town with all the necessities available within said town, I would move there in an instant. I've searched for this, in the past, it doesn't exist. I live in the next best, a <50K population town where I can get most necessities via walking/biking, but have to contend with hostile vehicular traffic that is especially daunting on longer routes to the outskirts of town that are only serviced by freeways (like the college I used to work at)-- I am terrified to bicycle on these routes with 85mph traffic brushing past (technically those sections are not "freeways", but are indistinguishable save the signage "begin freeway" [no bikes] "end freeway" [bikes allowed]). For long range travel, expand passenger trains. There is an Amtrak stop in my town, and I travel via Amtrak extensively to visit friends-- it is a very nice way to travel long distances.