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As a youngster a friend of my Dad explained as follows:- Faster truck (a) catches up slower one (b) and Flashes, when road is clear B flashes lights, A pulls out and turns OFF Headlights (So not to dazzle B) passes B. B then Flashes A back in, A flicks tail light (only one) off (Thank you) He added that most Lorries only had an off side mirror. Sounds feasible to me!
Ian
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I don't suffer from Insanity
I ENJOY every Minute of it  :
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