Formula to work out stopping distances.

One of the parts of the theory test that people always say they struggle to remember is the stopping distances.  Well there is a formula to help you work them out, so as long as you can remember the formula and are abel to do the simple maths then you would be able to work out the distance when taking your test.

The formula is.  speed x first number, divided by 2, plus the initial speed.

To work out the 30 mph stopping distance, which is 75ft.

30 X 3 = 90.  90/2 = 45.  45 + 30 = 75.

To work out the 40 mph stopping distance, which is 120ft.

40 X 4 = 160.  160/2 = 80.  80 + 40 = 120

This continues to work through the rest of the speeds.

The next thing to remember is what effect that the weather will have on the stopping distance.

Rain/wet weather can double the distance needed to stop.

Snow and ice can increase it by as much as ten times.

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