When you're a baby, your only restriction to your freedom is how far your feet will take you (and the reach of your parent's arm).
When you're a kid, your only restriction to your freedom is how far your bicycle will take you (and the fear of what your parents will do to you if you go too far).
When you're a teenager, your only restriction is the gas in your fuel tank (and the fear of what your parents will do to you if you're late getting home).
When you're a college student, your only restriction is how much money you have for gas (and the fear of what your parents will do when you fail that next exam).
When you're an adult, your only restriction is how much time you have to travel (and the fear of what your boss will do to you if you're late for work).
When you're retired, your only restriction is how well you can manage a car.
When you're too old to manage a car, your only restriction is how far your feet will take you, which isn't very far because by then you remember how nice it was to have a car.
For most people, a car = freedom, and that's a hard thing to surrender.