What is the maximum speed you are allowed to drive a bus with luggage trailer on main roads?

In Germany, when driving a bus with a luggage trailer on main roads (which are generally outside built-up areas but not on highways), the maximum allowed speed is 80 km/h. This lower speed limit is set to ensure safety because the combination of a bus and a trailer is longer and heavier, affecting braking distances and maneuverability. Even if the bus itself could technically go faster, the trailer requires you to drive more cautiously. Remember, adhering to this speed limit helps prevent accidents and ensures better control of the vehicle combination.