When driving on main roads, which vehicles must use the hard shoulders where possible?

In German traffic rules, slow-moving vehicles such as agricultural tractors and machinery, as well as mopeds, are required to use the hard shoulders when possible. This is to ensure the safety of both these vehicles and faster-moving traffic.

The reason why these vehicles must use the hard shoulder is because they often travel at much lower speeds than other vehicles on the main roads. By using the hard shoulder, they help prevent traffic congestion and reduce the risk of accidents.

Small-engine motorcycles are typically not required to use the hard shoulder, as they are generally capable of keeping up with the traffic flow on main roads. Understanding these distinctions is essential for safe driving practices and adherence to traffic regulations in Germany.