Moreover, private cars can not carry many passengers at a time yet occupy spaces in the street. As the number of cars is increasing in the road so does the traffic jam. Perhaps the major disadvantage of cars, in general, is the huge damage they do to the human health and to the environment. More cars mean more pollution. The environment pollution is a serious issue today and at any cost, we must reduce the amount of pollution and if we consider it then owning a car is never a good idea.