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Sorry I wasnt thinking of self scan as you shop but the self service till as a checkout. My wife always uses self scan as she shops in Tesco at BHill

I think that this problem is due to lack of knowledge of the correct signalling proceedure at roundabout so people are confused some signal at every exit, some only to turn right, some not at all. As regards self checkout jn supermarkets I read that a uni in the USA did a research jnto into it...