Answer
The average car length is about 4-5 meters, or 15-16 feet.
Work Step by Step
From day to day experience, you have a rough estimate as to how long a car is. We know that a car is generally about 2-3 times the height of a person. 1.5 meters is about 5 feet, and would represent a very short person. Multiplying 1.5 meters or 5 feet by 3 gives you a ball park estimate of the length of a car.