Best Ways to Remember braking distances

If you're about to give a test for your driver's license, the braking distance is one particular thing that must be troubling you. It's a lot of numbers to remember for something that you're probably not going to do while on the road. If a car stops ahead of you, you're not going to have the time to do a match before you hit the breaks. So, if you just need to pass the theory test, there are two numbers to remember; 20 and 2. At a speed of 20 mph, you need to hit the brake at 20 x 2 = 40 feet before. After that, you can just increase the multiplying factor 2 by 0.5 for every 10 mph in extra speed. So, 30 mph x 2.5 = 75 feet, 40 mph x 3 = 120 feet and so on.