What is the generic maximum speed at which a passenger car may travel on this type of road as indicated by this sign?

The sign in the image indicates the start of a 2+1 road, i.e., a road with three lanes that allows traffic in both directions. The central lane is used alternately to facilitate overtaking manoeuvres. Generally, on this type of road, the generic maximum speed for passenger cars is 90 km/h, which will also be the maximum speed at which they may overtake.