If you sit at a red light long enough and focus on one particular car, your signals will eventually sync. Maybe only for a couple of blinks because they’re not flashing at the same speed, but it’ll happen. Otherwise, there are many factors affecting why it doesn’t happen. The simplest is that most manufacturers use different modules to make their signals flash. A Toyota and Ford might be off by milliseconds, but that in itself means they will never sync perfectly with each other. The other big factor is that everyone turns on their signals at a different time. If you and the car next to you (of the same make/model) flipped on your signals at the same exact second, then it might be perfectly synchronized.
I used to sit at a turn signal that took two minutes to turn green every morning on my way to work. Thought long and hard about this, apparently.
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