I think you live in a different Prague than I do, or you don't travel near the city centre often. When I tried to use trams in summer, they were full of people, so much I couldn't move, smelling and incredibly hot. I was very happy when my car finally got fixed. Yes, there are a lot of problems with driving (parking, one-way roads, ...), but it's much more comfortable, so much, that the discomfort caused by traffic is next to none.