Which of the following documents certifies that a truck is authorized to be driven on public roads?

In the photo, next to lorries driving along a city street, you can see a driving licence, a vehicle registration certificate and a bill of lading. The vehicle registration certificate confirms that a lorry is admitted to traffic - answer B.

The Road Traffic Act states that the document confirming that a motor vehicle is admitted to traffic is the vehicle registration certificate or a temporary permit. It is issued by the starost (head of the district authority) at registration, together with legalised number plates. A category C driving licence (answer A) confirms the driver's entitlement, not the condition of the vehicle, and a bill of lading or consignment note (answer C) is a document for the load and the contract of carriage - it describes what you are carrying and for whom. In the vehicle registration certificate you will find the vehicle's details, the maximum permissible mass, the number of seats and the date of the next technical inspection; it is precisely a valid inspection that decides whether the vehicle is still admitted to traffic. You do not have to carry the certificate itself in a vehicle registered in Poland, because the police officer checks it in the Central Vehicle Register.

Legal basis: Art. 71 para. 1 and 2, Art. 73 para. 1 and Art. 38 of the Road Traffic Act (Prawo o ruchu drogowym)