Priority when refueling at a petrol station have:

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Drivers of vehicles with the right of preferential passage; they do not use special warning signals while doing so.

Drivers of public transport vehicles, e.g., buses, and truck drivers.
Drivers of vehicles with the right of preferential passage; however, they must use special warning signals to alert other drivers.

Legal Basis: You can find this in § 44, paragraph 2 of Act No.

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Legal basis: Zákon č. 361/2000 Sb., § 41 odst. 9

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