I used to do that in Australia, using the "hazard lights". In Finland, they are indeed called "emergency lights" and the police are rather strict about using them only in emergencies - e.g. not when simply pulled over to use your phone or calm your toddler.

Truck drivers do that in the US. I do that in my car, too. Sometimes it's too dark to see the handwave out the back window.

This is true for Turkey as well.