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xkcd #2932: Driving PSA
(imgs.xkcd.com)
Alt text:
This PSA brought to you by several would-be assassins who tried to wave me in front of speeding cars in the last month and who will have to try harder next time.
A grocery store near my house has an entrance exactly like this, except the roads are 3 lanes each. It's genuinely a nightmare to navigate if it's even remotely busy.
A simple (albeit inconvenient) way to improve safety in this case is to prohibit turning left and allowing for a U turn somewhat close by.
A.k.a. a Michigan Left, one of those things like roundabouts that's safer and more efficient but people get annoyed at.