less than 5k, so I can ride my bike 10-15 mins, go with public transportation in 20, jog in 30, or walk in an hour, a car would never come into question.
If I had a longer commute I would much rather seat in a train and read or do something else than drive, a car is just for the lazy people that cannot walk to the nearest public transportation stop (in countries where there is a good public transportation system, hence the truly developed countries)
I know that if I lived in the US unless I lived around 5k from work I would need a car. When I lived in texas, I tried to survive for the first couple of months on walking and public transportation and it was challenging, then I got my friends to drive me around and life did go a lot easier
For years I lived about 50km from work. Even if I were to take a bus/train all the way to the little town I was living in I'd still probably have to walk 3-4km to get to my house because there's a zero percent chance there would be a bus that would go remotely close to where the house was located. I can't imagine what my transit times would've been either.
Oh and forget riding a bike anywhere around here. You will get run the **** over because there are almost no bike lanes anywhere and drivers aren't expecting cyclists.
Something else that complicates things is businesses are also located far apart. If you tried to take public transportation to run errands it's going to take you all day, everything is just too spread out. Also the US has so many rural areas, I can't see that it would be cost effective to have mass transit serve those people.