Come si chiamano (greco e inglese) e qual è lo scopo?

When you see those it basically means there are traffic lights close on the direction you’re going. However if you see them doing an orange blinking pattern it means you need to slow down cause the next traffic light is currently on red. (Idk the name in English nor in Greek).

When flashing, they warn you that you will be met with a red traffic light if you’re going the speed limit. They’re usually on roads where there are curves leading up to the main traffic light, bad visibility, a high speed limit or other factors.

If they’re off, you should expect to be met with a green light. Or they may just not be functioning. You can never know for sure.