Overpass or underpass to turn back

On roads with two separate carriageways, here there is an overpass or an underpass to make a U-turn and go back. If the sign has a green background, it is about a motorway.

It is not mandatory: it only says you can do it.

Word: Inversione = turning to go back the way you came.

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