The most important rule of thumb, which you need for the theoretical examination, summarized again for you.
Reaktionsweg:
Recognize - decide - react
We humans assume a reaction time of about one second
the reaction path in m
Example:
speed: 80 km/h
reaction time 2 seconds
Bremsweg:
From the start of braking to the standstill of the vehicle.
Braking distance in m
Example:
speed: 40 km/h
Emergency braking:
Stopping distance:
Detect the danger until the vehicle comes to a standstill
Stopping distance in m = reaction distance in m + braking distance in m
Stopping distance with emergency braking: