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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.
First to stop is the safer option. I feel that most people around here follow that too.
It also has a rare benefit of seeing the interaction between a majority first-to-goers at a 4 way.