In Auburn, every fourth crash is from the rear end and almost every second rear end crash (42%) results in injury. Young drivers have been involved in every fourth rear end crash (26%).
Many of these crashes could have been avoided had the 3 second gap been maintained.
When you see the brake lights of the car in front come on, you hit the brake to slow your car down...but in actual fact, there is a small time delay before you do that - your reaction time.
During that period of time, your car is still moving at the same speed. The faster you are going, the further you will travel during this time.
So your total stopping distance is actually made up of your reaction distance and the distance it takes for your car to stop once you've pressed the brake.