The origins of ‘horn ok please,’ India’s most ubiquitous phrase (2016)
Different cultures have different unwritten behaviours on roads.In the mountains of Italy, drivers give a short honk before entering a turn on a serpentine road, which usually can't be seen around. If there is no responding honk, they will take the full width of the road (making the very tight turn easier and faster). Tourist drivers have to pick up on this :)In much of Europe oncoming cars flash their lights to warn others about dangers and (especially) speed traps or police checks, so they can slow down in time.Here in Lithuania, flashing your warning lights (the four orange ones on the corners of the car) means thanks, for example if you let someone merge from one of the very short onramps. I've never seen this in Germany, where onramps are however much longer.And amongst truck drivers it's pretty wide-spread to blink right to tell a following car you think it's safe for them to overtake you and blink left when you think it no longer is. At least on long roads where there are no obvious right turns. I flash them a grateful hand sign when passing their mirror.