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

The D-43 sign visible on the right indicates the 'end of a built-up area', which changes the speed limits to those applicable outside such areas. On the visible single-carriageway two-way road outside a built-up area, the maximum permitted speed for a bus is 70 km/h, according to Art. 20 para. 3 pt. 2 lit. b of the Road Traffic Act.