Sometimes people just don't have a choice; it's too far to go other than by car. They just don't have a choice sometimes.
People travelling or commuting by public transit are walking enough to meet the recommendations, and their injury risk is 95% lower than people travelling by car, so it means a healthier lifestyle and fewer people at the emergency room. But for this you need to have a choice. If you live in a lower-density area, you have no choice but to use your car, and if you live in the poorer inner city, you walk, but you are exposed to the threat of traffic.
Thanks.