What is the meaning of the sign?

- Correct answer: Portable flashing caution sign situated before a road works.
- Portable flashing sign upon leaving an inter-urban road to enter a motorway (freeway).
- Portable flashing sign for advertising to drivers.
- Portable flashing sign before entering an airport.
Why this is the answer
The correct answer in the official bank: Portable flashing caution sign situated before a road works.
A portable panel with orange and black stripes and flashing lights is placed at road works. It warns drivers of the obstruction ahead and guides them to pass on the side the arrow shows, usually into another lane. Slow down, watch for workers and equipment, and follow the arrow. Such panels are never used for advertising and have nothing to do with airports or motorway entrances.