Maximum width (for example 2.30 m)

The number says how wide the vehicle can be at most, and it applies to everyone, even those without an engine and pulled by animals. Those wider cannot pass; those equally wide can pass.

It is not the width of the road.

Word: Larghezza = how wide it is from one side to the other.

The exam is in Italian: key terms and trap words are kept in Italian, so you learn them.