When did a truck driver turning on his signal become the national sign of speed up very fast to go around?

773147

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617698

{"replyTo":"","text":"I actually use my turn signal to get four wheelers to stop riding next to my bumper. They speed away and I cancel the turn signal. ","replyToPid":0}

796016

{"replyTo":"","text":"I have been trying to figure it out as well.","replyToPid":0}

731716

{"replyTo":"","text":"Probably ever since the first truck driver used his turning signal the first time","replyToPid":0}

791349

{"replyTo":"","text":"think it was Aug 19 1971 in eureka CO","replyToPid":0}

772762

{"replyTo":"","text":"😂😂😂😂😂😂","replyToPid":0}

764851

{"replyTo":"","text":"ikr.","replyToPid":0}

280160

{"replyToPid":0,"replyTo":"","text":"look at the bright side, they are actually paying attention to their surroundings."}