Is it required to maintain a minimum distance of at least 100 metres from the vehicle in front on a road marked in this manner?

Explanation
Correct answer: No
No. Sign D-7 marks an expressway. Under art. 19 para. 3a of the Road Traffic Act, on an expressway a driver must keep a gap from the vehicle ahead of no less than half the number expressing their speed, in metres. It is not a fixed 100 m but depends on the current speed.
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Is it mandatory to maintain a minimum distance of at least 100 metres from the vehicle in front on a road marked in this manner?