Correct answer
When, with normal eyesight, at some point a plate cannot be read at 10 m or a dark vehicle cannot be distinguished at 50 m.
When, with normal eyesight, at some point on the carriageway a number plate cannot be read at 10 metres or a dark-painted vehicle cannot be distinguished at 50 metres. Either condition is sufficient. It is not a requirement to read a plate at 50 metres. Lighting choice also depends on road type and other conditions: avoid dazzling and comply with articles 100 to 102.
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Whenever a plate cannot be read at 50 m, even if both the 10 m and 50 m conditions are met.
When, with normal eyesight, at some point a plate cannot be read at 10 m or a dark vehicle cannot be distinguished at 50 m.
Only when there are no streetlights, even if both visibility conditions are met.
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