When drivers can't (don't) read

It’s happening again. I flash my headlights at the car in front of me to get the driver’s attention. We’re on the STAR tollway where the speed limit is 60 kph minimum and 100 kph maximum for private cars. The car ahead of me is hogging the passing/overtaking lane or the leftmost lane of a highway at a steady 80 kph.

There is no response. We go steady and slow until I follow other drivers and just overtake on the inside or on the right lane, which is considered dangerous and designated as a driving offense in some countries. Here, it’s just considered passing.