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Approximately calculate the braking distance of a car from a certain speed. You can use various parameters as a basis.
There are different surfaces that affect the braking distance. Of course, these are only used approximately (idealized) in the calculation.
If the road surface is dry, we assume a normal road surface with average tires. In the event of emergency braking, a braking deceleration twice as normal is assumed. In the case of wet conditions, a normal grippy, clean road surface without aquaplaning should be assumed. When it comes to black ice, you basically have to differentiate between wet black ice (worst friction value), normal and dry black ice (best friction value for black ice) - we assume normal black ice in the calculation.
On the other hand, you can specify whether a delay time should be observed before braking begins. This includes the reaction time that a typical driver takes to react to an event, the time until the brake pedal is actually pressed, as well as the time until the brakes technically respond and the real physical braking effect. In simple terms, the path with this delay can also be seen as a reaction path. Statistically, this is quite good at 1 second, which is included in our formula.
By the way, the rule of thumb for the braking distance without delay time, as given in driving school, is as follows:
Speed (km/h) squared / 100 = braking distance (m)
Please note that the values determined are of course not binding, but are based on the “rule of thumb” specified by law. The app is therefore definitely suitable for learning for the driving test.
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