I gitcha Bro...
I usually cut them some slack if they look up to realize they have moved in too far.
You know how it is... A/C going full blast in 100° F weather, music blasting away, and those urgent cell phone texts that need to be addressed...
Who's got time to pay attention to a cross walk... Ha
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)