About Signage: E/A/N-roads, K-signs and speed-indicating road markings: which statement is WRONG?
The marking IS an indication of the maximum speed, but NOT a guarantee; the real maximum speed is indicated by signs.
An A-road is a Dutch motorway and is often also part of an E-road, the international European main route.
An N-road is also a kind of motorway, just like an A-road.
K4 is the high decision sign with lane and turn-off panels; K3 is the sign to a service area with name and facility symbols.
Explanation
trap: visual resemblance (wide road, high speed) confused with the legal motorway category. Book p.78 - an N-road is a Dutch main road that is NOT a motorway