What is the maximum speed allowed beyond these signs when you are carrying a six-year-old child in the sidecar of a motorbike?

In the photo you are driving on a two-way single-carriageway road with a double solid line, next to which there are signs A-12a "road narrows on both sides" and B-33 "70". When carrying a six-year-old child in the sidecar of a motorcycle, you may drive beyond these signs at no more than 40 km/h - answer B.

The Road Traffic Act states that the speed limit for a motorcycle (also with a trailer), a quadricycle and a moped carrying a child up to 7 years old is 40 km/h. Sign B-33 allows 70 km/h here, but that is the limit for vehicles without such a restriction; when there are two limits, the lower one applies, so with a six-year-old you drive at 40 km/h, not 50 or 70 km/h (answers A and C). In fact, the Regulation on road signs and signals says directly that sign B-33 with a speed higher than 50 km/h in a built-up area does not apply to a motorcycle carrying a child up to 7 years old. The sidecar changes nothing - the rule is about a motorcycle as such. Sign A-12a warns that the roadway narrows on both sides - an extra reason to be careful, because a motorcycle with a sidecar is wider than a two-wheeler. The child, like every passenger, must wear a protective helmet.

Legal basis: Art. 20 para. 6 point 3 and Art. 40 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym); § 27 para. 1 and para. 3 point 4 and § 7 para. 3 of the Regulation on road signs and signals