In what conditions are you allowed to carry an intoxicated passenger on a motorcycle?

This question is about carrying an intoxicated passenger on a motorcycle. You may carry such a passenger only when they are carried in a sidecar - answer B.

The Road Traffic Act prohibits carrying a person who is intoxicated, after drinking alcohol or under the influence of a substance with similar effects on a bicycle, moped or motorcycle, unless the person is carried in a sidecar. Answer A ("in any condition") directly contradicts the prohibition, and answer C invents a speed limit that is not in the provision - riding slowly does not make a drunk passenger able to keep their balance on the rear seat. The exception for a sidecar makes practical sense: a passenger in the sidecar sits low, does not have to hold on or lean on bends and does not affect the balance of the motorcycle, so they will not tip it over if they fall asleep or make a sudden movement. Even in a sidecar, an intoxicated passenger must wear a fastened helmet, and you make sure that they do not try to stand up or get out while you are riding.

Legal basis: Art. 45 para. 2 point 2 and Art. 40 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)