About Maximum speed with a trailer or caravan: which statement is correct?
With a trailer or caravan you may drive at most 80 km/h inside the built-up area.
On the motorway you may drive at most 100 km/h with a trailer or caravan.
With a trailer or caravan separate fixed maxima apply (50 inside the built-up area, 80 outside, 90 on expressway/motorway up to 3,500 kg).
With a combination longer than 7 metres you may use any lane on a motorway with three or more lanes, as long as you move back right in time.
Explanation
Book p.229 - with a trailer or caravan separate fixed maxima apply (50 inside the built-up area, 80 outside, 90 on expressway/motorway up to 3,500 kg). These can be lower than what the sign allows for an ordinary car.