Originally Posted by
droy45
I don't understand this thing about magnets to make lights change. I always noticed lights changing on regular intervals even when there are no vehicles present. Then some of them go to blinking at night. Why would I see lights going red or green without a vehicle there to trigger anything?
Not all traffic light systems are set up the same way. Most setups are determined by state code, often based on the volume of traffic on the various roads/streets that intersect.
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