About Maximum speed with a trailer or caravan: which statement is WRONG?
On expressways and motorways the maximum with a trailer or caravan is 90 km/h, not 100. 100 km/h does not appear in the trailer maxima.
Outside the built-up area on an ordinary road it is 80 km/h; the 90 km/h only applies on expressways and motorways.
On the motorway you may always do 90 km/h with a trailer or caravan, regardless of weight.
Inside the built-up area the maximum with a trailer or caravan is 50 km/h.
Explanation
Book p.229 - the 90 km/h on expressway/motorway only applies if the permitted maximum mass of your trailer or caravan is not more than 3,500 kg. If it is heavier, you stay at 80 km/h.