In the south it is considered a thank you when they flash the hazard lights twice if you pulled to the side so they can pass you but if they speed past you and you didn't let them by if they flash their hazard lights twice it is a fuck you lol.
In Europe you flick the indicators right/left/right to thank the driver behind you, and you signal the driver in front of you with high beams when it's safe to merge.
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