Correct answer
At least 70 metres, and more if safety requires it.
Maintain at least 70 metres. The R-300 figure applies to the preceding vehicle, including a motorcycle. The sign’s own exception is when about to overtake, which this question excludes. You must also maintain enough distance to stop without collision if the vehicle ahead brakes suddenly; conditions may require more than 70 metres. Fifty metres are insufficient, and the figure is not removed because the preceding vehicle is a motorcycle.
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No more than 50 metres.
No numeric separation, because the figure does not apply to motorcycles.
At least 70 metres, and more if safety requires it.
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