We have one car and my wife generally takes it to work (unless she's commuting on her bike). I don't need motivation, I usually don't have a choice, or at least the choice I have is to take the bus which would be $5/day and take about 3 times longer to get to work, and to get back home. That said, when we did have 2 cars, I rode anyway. Clears your head in the morning, washes away the stress in the evening, saves on parking.