>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

In India, the truck drivers blink right to tell you its safe (or want you) to overtake from right and they blink left if it's safe (or they want you) to overtake from the left.

Makes highway driving very confusing since a blinking left truck on highway means the exact opposite of city driving (YOU can go left vs I am going left).

yeah, self driving car is not coming anytime soon to India.