Correct answer
That the speed is being reduced considerably.
It warns of substantial braking or stopping. Article 109 allows repeated brake-light use or short, rapid up-and-down arm movements whenever possible. Do not delay necessary braking or pump ABS to signal. A lateral movement additionally needs the relevant indicator; immobilisation also requires the lights appropriate to road and visibility.
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Traffic congestion one kilometre ahead.
That traffic congestion means vehicles must travel on the hard shoulder.
That the speed is being reduced considerably.
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