About Signage: E/A/N-roads, K-signs and speed-indicating road markings: which statement is correct?
If the road marking shows you are on a '100 km/h road', you may really drive 100 km/h, regardless of which sign is present.
An N-road is also a kind of motorway, just like an A-road.
Sign K3 is the high decision sign above the motorway; K4 points to a service area.
An A-road is a Dutch motorway and is often also part of an E-road, the international European main route.
Explanation
trap: letters treated as exclusive categories instead of overlapping layers. Book p.78 - an A-road is a Dutch motorway and is often also part of an E-road, the international European main route