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?

Explanation
Correct answer: No
No. Sign D-9 marks a motorway. Under art. 19 para. 3a of the Road Traffic Act, on a motorway the minimum gap from the vehicle ahead should equal half the number expressing the speed, in metres. It is not a fixed 100 m but depends on the current speed.
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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?
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When driving behind a vehicle that is travelling at a speed of 80 km/h on a road marked in this manner, is it mandatory to keep a minimum distance of at least 40 meters from it?