From what I can see hardly anyone adheres to the arrows anyway. As long as you keep 2m apart from people does it matter whether you are going the same way or not?
I wait at busy aisles and wait for people to finish at an item before I go to it, but most people just seem to do their shop as usual. Makes me wonder if we should just scrap the arrows, and try to enforce the 2m ideal more? Also it would free up staff from monitoring people on the right direction.