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by imtringued 1978 days ago
Density is one factor but the complete separation of commercial and residential zoning is also a huge factor.

In a lot of walkable cities the first floor of most buildings is often reserved for low impact commercial uses like shops or restaurants.

I am in a car dependent city (I need the car to go to work) but the fact that there are 3 stores in walking distance helps cut down on the voluntary car trips significantly. Even the weekly trip to a far away store takes 10 minutes at most by car.