I grew up at the edge of London. Very much low density suburbia.

10 mins walk to railway station, 15 min on train to train to city centre. Faster and easier than driving. Cars were for short trips in the area, luggage, and out of town trips.

Even in a small town my kids used busses quite a bit.

That's cool, but suburban US cities don't have a city center. It's a sprawl of strip malls. There's no route that can solve this problem. Cities would need to be redesigned from the ground up.