At a sharp bend on the N-road near Vaals hangs a blue rectangular sign with a white '60' on it. Which sign is this, and must you comply with it?

Sign A1, maximum speed — mandatory to obey

Sign A4, advisory speed — you may ignore it without a fine

Sign A3, matrix sign — mandatory to obey

Explanation

False — trap: colour/shape ignored. **A1 is round with a red border, not blue rectangular.** Blue rectangular = A4, advisory. Book p.238.