In the car you have to pay attention to the road, you have a lot of responsibility and put yourself and others at risk if you don't pay attention. You always have to return to the place you left your car and usually have to pay to park it. I really love public transport and outside peak hours i usually get a seat so I can read a book. If I have to drive, all that time is completely wasted because the attention paying precludes doing anything useful with my time.