Correct answer
Increase the distance from the vehicles ahead of us.
Increase the gap to the vehicle ahead and adapt speed. Loose gravel can reduce grip and be thrown against the windscreen. More distance reduces exposure to those stones but does not guarantee that an impact will never occur. A clean windscreen aids vision; it does not protect against stones. Accelerating is not protective and may increase risk.
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Nothing, because if the windscreen is clean the risk of breakage from gravel is reduced.
Increase the distance from the vehicles ahead of us.
Increase speed to reduce the effects of the impact.
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