Correct answer
Unexpected noise from low-flying aircraft.
The nearby location and unexpected noise aircraft may produce. This can startle or distract; remain attentive to the road and adapt driving. The sign does not state that noise is always deafening or that every acoustic warning becomes impossible to hear. It does not itself warn of a narrowing or gradients.
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A mandatory road narrowing beside every airport.
Unexpected noise from low-flying aircraft.
A mandatory steep gradient on nearby roads.
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