Which of the following vehicles can you overtake when you're riding a light four-wheeled vehicle (microcar, quad) on the road, once you go past this sign?

The B-25 "no overtaking" sign prohibits drivers of motor vehicles from overtaking multi-track motor vehicles. This prohibition does not apply to single-track vehicles, which include motorcycles. This means that it is permitted to overtake a single-track motorcycle past this sign, provided that this manoeuvre does not involve crossing the visible solid double line.