About Signage: E/A/N-roads, K-signs and speed-indicating road markings: which statement is WRONG?
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 a Dutch main road that is NOT a motorway.
Along a '60 road' there is a 60 km/h speed sign or a zone-60 sign; if those signs are absent, you may drive 80 km/h. The marking is an indication, the sign decides.
Sign K3 is the high decision sign above the motorway; K4 points to a service area.
Explanation
trap: sign numbers swapped. Book p.77 - 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