Correct answer
A minimum gap of 70 metres.
At least 70 metres. R-300 prohibits driving without a gap at least equal to the stated distance, except to overtake. It does not specify a maximum gap. Article 54.1 still requires the gap needed to avoid collision: keep more distance if speed, grip or other circumstances require it. The overtaking exception does not permit following so closely that you cannot stop without a collision.
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Exactly 50 metres, even if conditions require more.
A minimum gap of 70 metres.
A maximum gap of 70 metres.
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