Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/mothermooseknuckle on 2023-06-26 00:27:10+00:00.

Ever notice when you’re behind two cars that have their turn signals on and while they’re currently blinking at alternating intervals, they always seem to sync up and blink at the same time before going back to alternating blinks. How?