eli5 why at stop lights turn signal flashes sync up for only a little bit

Question

eli5 why at stop lights turn signal flashes sync up for only a little bit

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Answer 1

In any two or more consistently repeating sets of patterns, there will always be a moment in time when they appear to “synch up”, because sooner or later the patterns are on or off at the same moment. So for example of you have a flasher that flashes on every 3 seconds, and another one that flashes every 2 seconds, they will flash at the same time every 6 seconds, 12 seconds, 18 seconds etc. etc.