The model: The braking-distance rule of thumb: (speed:10)² : 2
Braking distance = (speed:10) x (speed:10) : 2 (Book p.126). At 80 km/h: (8 x 8) : 2 = 32.00 m. Not 64 m — the division by 2 belongs to the formula itself, not a separate correction.
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