If you drive a bus with a light trailer, what's the maximum speed at which you can drive once you go past this sign?

In the photo you can see signs D-10 "end of motorway" on both sides of the road, and beyond them a roadway with two lanes in one direction, separated by a barrier from the opposite one. When driving a bus with a light trailer, you may travel here at a maximum of 80 km/h - answer A.

The Road Traffic Act sets out that outside a built-up area a bus may travel at a maximum of 80 km/h on a motorway, an expressway and a dual carriageway with at least two lanes in each direction, and at 70 km/h on other roads. Beyond the end of motorway sign you are still driving on a roadway with two lanes in one direction, separated from the opposite one - this is a dual carriageway, so the limit for a bus is 80 km/h. A light trailer does not change this limit, because in this rule a vehicle combination has the same limit as a bus. The value 70 km/h (answer B) would apply to an ordinary single-carriageway road, and 60 km/h (answer C) does not come from the rules for such a combination.

Legal basis: Art. 20 para. 3 point 2 letter a of the Road Traffic Act (Prawo o ruchu drogowym)