THis poll requires multiple answers. Guess, biggest motovation is ethics , however. Why. World quest for resources makes the world more violent. Traffic gridlock. Effect of traffic congrestion upon human behavior. And removes Americans from any form of exercise. And I do enjoy my time on the bike. That is a rare experience in a car. Those road ragers make me furious.
But, I am not car free. Just think it has its beneficial aspects and I do believe in minimizing the useage of the car.