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Posted Under: Zong on Sep 3, 2000


Question 476 of 1002

What is correct about stopping distance?
Justification

Stopping distance consists of reaction distance and braking distance.

On wet summer asphalt, emergency braking distances can double compared to that on dry asphalt.

In winter conditions, emergency braking distances can quadruple compared to that on dry asphalt.

When braking controlled and comfortably, braking distance on dry asphalt is approximately 120 metres when driving at 80 km/h in a regular car.

The emergency braking distance on dry summer asphalt is approximately 32 metres when driving at 80 km/h in a regular car. The emergency braking distance on dry summer asphalt is approximately 32 metres when driving at 80 km/h in a regular car.
Options
On dry asphalt, the stopping distance is shorter with studded tyres than with summer tyres
At 80 km/h, the stopping distance is usually no longer than 40 metres on icy roads.
With good studded tyres, the braking distance is almost the same on dry and icy roads.
The braking distance can be twice as long on wet asphalt than on dry asphalt, and this increases the total stopping distance




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