What is the maximum speed you are allowed to drive a bus outside built-up areas when there are not enough seats for all passengers?

You answered correctly. In Germany, if you are driving a bus outside of built-up areas and there are not enough seats for all passengers (so some must stand), the maximum allowed speed is 60 km/h. This rule exists to enhance safety, as standing passengers are more at risk in the event of sudden braking or an accident. Always remember: whenever a bus carries standing passengers, the speed limit is reduced to 60 km/h outside built-up areas. If all passengers are seated, higher speed limits might apply, but only if specifically allowed. This helps protect everyone on board.