What is the maximum speed you may drive on a main road in a truck with a gross vehicle weight rating of 5.5 t and a trail with a gross vehicle weight rating of 2 t?

In Germany, trucks with a gross vehicle weight over 3.5 tons towing a trailer have a maximum speed limit of 60 km/h on main roads (Landstraßen). This rule is in place for safety because heavier vehicles with trailers require longer stopping distances and have reduced maneuverability. Therefore, even if the truck or trailer itself could technically go faster, the law sets this speed limit to prevent accidents. Knowing this helps you understand speed limits for heavy vehicles combined with trailers in non-urban areas.