What should drivers do if, due to a malfunction, they are driving at an abnormally low speed on a motorway, disrupting traffic flow?

Drivers operating vehicles with a maximum authorized mass of up to 3,500 kilograms who experience an emergency, such as a mechanical failure, and are forced to drive at an unusually low speed, disrupting traffic flow, must use the motorway shoulder. They should exit the motorway at the earliest opportunity to avoid posing a risk to other road users.