A square traffic light or lane-control light as in the picture must be obeyed...

Explanation

Lane-control lights are a specific type of traffic light used to manage traffic on a multi-way road, highway or tollway. Typically, these lights allow or forbid traffic to use one or more of the available lanes by the use of green lights or arrows (to permit) or by red lights or crosses (to prohibit)

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You encounter a vertical sign that warns about the proximity of a section of road with many dangerous bends. Is it permitted to use the rear fog lamp at night in this area?

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