Which of the following traffic signs restricts vehicle entry, regardless of freight height?

Why this is the answer

The correct answer in the official bank: 416

Sign 416 prohibits entry to any vehicle whose total height exceeds the figure shown, here 4.6 metres. The height is measured including any load, so the limit applies whether the vehicle carries tall freight or none at all. Sign 417 limits width, not height, while signs 145 and 150 are only warning signs.

Topic: Traffic signs. The bank marks it for these classes: Light truck (C1), Heavy truck (C), Tractor (1).