The problem with waving carts through (cars have the right of way)in order to be a nice guy or gal, the cart then waves for you to go instead. This goes back and forth for awhile until one decides to actually go, at which time the other one also decides to go and they go....
....car drivers need to quit being nice guys or gals. If you want to be nice guys or gals, the next time at the bar, just buy a stranger a drink..