Road Traffic Act and traffic regulations (Færdselsloven) for a bus with trailer
This domain checks whether you can apply Færdselsloven and its bekendtgørelser to a category D bus that is towing, rather than reciting car rules. The trailer does not create a new legal category - the bus is still a bus - but several general limits tighten automatically the moment a trailer is coupled.
Speed limits that change with a trailer
- Motorvej: a solo bus may run at 100 km/h, but a bus with a trailer is capped at 80 km/h.
- Outside built-up areas (uden for tættere bebygget område) the general limit is 80 km/h, but a vehicle towing a trailer is capped at 70 km/h unless a sign allows more.
- Inside built-up areas the limit is 50 km/h and the trailer changes nothing.
- Posted signs and local restrictions can only lower these ceilings; a 110 sign on a motorway never lifts the trailer cap.
Priority and bus-specific rules
- A bus pulling out from a bus stop inside a built-up area has priority; approaching drivers must give way to it. This holds with or without a trailer.
- Unsigned junctions follow right-hand priority (højrevigepligt). Leaving a property, a filling station or a car park creates an unconditional duty to give way (ubetinget vigepligt).
- Because the combination needs far more gap and time to accelerate, the practical judgement at a bus stop is whether you can clear the stop before the next vehicle arrives - not whether you have the right to pull out.
Entitlement and papers
Category D alone does not cover a trailer above 750 kg; you need DE. The trailer must be registered with its own plate, its lights must work, and the bus's insurance must extend to the combination. The coupling must be rated for the trailer's permitted total weight.
Worked example
A driver who normally drives a solo bus at 100 km/h on a motorway enters the same motorway with a loaded trailer. The sign reads 110. Which limit applies? The solo-bus limit (100) and the posted limit (110) are both higher than the trailer ceiling of 80 km/h, so 80 km/h is the legal maximum. If the posted limit were 70, then 70 would bind, because the lower ceiling always wins.
Traps that cost marks
- Quoting 100 km/h for a bus on a motorway while a trailer is attached.
- Forgetting the 70 km/h trailer ceiling on ordinary rural roads.
- Extending the bus-stop priority rule to stops outside built-up areas.
- Confusing D and DE entitlement, or assuming a light trailer is outside the registration and inspection system.