The braking distance is the longest on:
Show the correct answer
Correct answer
C. an icy road.
Explanation
The braking distance is longest on an icy road - answer C. On a dry surface (A) it is the shortest, on a wet one (B) clearly longer, but ice makes it several times longer.
The braking distance depends on the grip of the tyres on the road surface, that is on the coefficient of friction: on dry asphalt it is about 0.8, on wet asphalt about 0.5, and on ice only 0.1-0.2. At 50 km/h a car will stop after about 15 m on a dry road and after more than 20 m on a wet one, while on ice it needs as much as 80-100 m, and on top of that comes the distance covered during the reaction time. The Road Traffic Act requires you to drive at a speed that keeps the vehicle under control, taking into account the condition of the road and the weather, and to keep a distance that allows you to avoid a collision. On an icy road you slow down a lot, brake gently and early, and increase your following distance several times.
Legal basis: Art. 19 para. 1 and para. 2 point 3 of the Road Traffic Act (Prawo o ruchu drogowym)