On a provincial road near Kampen you first see sign J16 (roadworks) with the under-sign '500 m'. Further along there is a speed-limit sign with the under-sign '↑500 m↑'. What does this mean for your drive?
The roadworks start in 500 m; the speed limit applies for the next 500 m
The roadworks run for the next 500 m; the speed limit starts in 500 m
The roadworks and the speed limit both only start in 500 m
Explanation
False — you ignore the arrows. '500 m' without arrows means the sign applies 500 metres from here; '↑500 m↑' with arrows means the sign applies for the next 500 metres. So the roadworks start in 500 m, while the speed limit applies right away and runs on for 500 m. Book p.252.