Here in the UK, if I had to travel 'just 4km' then I wouldn't take a car. In any case it's the other 50% of journeys that are 4km+ (20% of journeys are 10+ miles) that are the problem:

https://www.energy.gov/eere/vehicles/articles/fotw-1230-marc...

The USA is a young country, built from the ground up around the automobile. Undoing that both physically and psychologically is just not possible in my opinion.