A driver of a vehicle equipped with a special orange warning light may use this light:

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Only during reduced visibility, such as rain, darkness, or snow, if their driving would endanger the safety of road traffic.
If it is necessary to warn other road users of imminent danger, for example, when it is necessary to suddenly reduce speed or stop the vehicle.

Legal Basis: You can find this in § 42, paragraph 1 of Act No.

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Legal basis: Zákon č. 361/2000 Sb., § 42 odst. 1

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