If you drive a bus whose maximum speed limit is up to 100 km/h, what's the maximum speed at which you can drive on the road once you go past this sign?

The visible D-10 "End of expressway" sign indicates that from this point, the regulations specific to this type of road cease to apply. This means you are entering a road where general speed limits apply. In accordance with the provisions of the Road Traffic Act, the maximum permissible speed for a bus outside a built-up area (on a road other than a motorway or an expressway) is 80 km/h.