It is obvious that the normal size of a car is not right. If you stand on the size of the road you notice that over 3/4 of cars have one or sometimes two passengers and these things are made for 4 (or even more in thes massive tanks people drive in the SouthWest).

Some statistics are actually absurd. For example Belgium, a country of (slightly) less than 11 millions inhabitants has 4millions cars registered. You could not even fill them all if you wanted to. I doubt US is better