About Speed signs A: maximum, matrix sign, advisory and zone: which statement is WRONG?
Traffic signs may be displayed on an electronic signalling sign; when a fixed sign and a matrix sign both show a speed at once, the lowest one applies.
A3 = maximum speed on an electronic signalling sign (matrix sign); A4 = advisory speed (blue rectangular sign).
The LOWEST indicated maximum speed applies, not the more permanent one.
A 30-zone sign only applies to the street it stands on; every side street needs its own zone sign again.
Explanation
trap: street-bound reading of an area sign. A sign with 'zone' above it applies to the ENTIRE indicated area, until the end-of-zone sign — not only to the street the sign stands on