How many feet should be allowed between cars driving on the road?

Cars driving on the road should be three seconds behind the car in front of them. For example, if a car is driving int front of you, wait until the back of that car passes a street sign or a spot on the road. Then count, one onethousand, two onethousand, three onethousand. If the front of your car has passed the sign before you reached, three onethousand you are too close to the car. If the sign passes the front of your car after you have reached three onethousand, than you can get closer. This is called the three second rule.