Is there such a thing as overtaking etiquette?

I was thinking about this the other day in a way. If someone wants to overtake me ill lower the speed on the cruise control and drop back then when I feel it’s safe to do so I’ll flash him in. I like to keep a good distance from other trucks especially after seeing a 4 truck pile up the other week on the M1 with all 3 trucks ploughing into each other to the one that stopped. I can only assume they was up each others arse.

I’ve had a few incidents where I’ve not seen a flash and moved in and thanked anyway. They most likely thought I was being a sarcastic ■■■■■

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