eli5 why at stop lights turn signal flashes sync up for only a little bit
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The turn signals are controlled by an electrical relay. Basically, an automated switch that turns the power on and off at a designated interval. The interval is set by the gov’t and probably has a timing from x.x to x.x seconds. Lots of different manufacturers make these relays and sell them to the auto manufacturers. The relay from Company A will work at a specific interval where the relay from Company B will have a slightly different timing (either slightly faster or slower).
Since we’re talking about milliseconds difference, the timing will eventually sync up for a few flashes. Basically, the faster turn signal will catch up with the slower signal, sync up, then pass it by and be out of sync again.
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