I can’t remember who it was, but the person in charge of Charlotte’s traffic light system, specifically uptown, was on Charlotte talks last year. They were very clear that most of the traffics signals in uptown are “dumb”. They work purely off time. The only thing they change to make it “smart” is vary the timing depending on the time of day. They can sync them to change together or offset one another, but very few have sensor loops in the ground to actually sense a vehicle. It’s really stupid that early in the morning I’m having to stop on trade for a light changing for no reason lol.
Also related to this are a lot of the new pedestrian signals say. “For audio signal only” or something like that. I don’t think they have any influence on the signal changing. Just whether or not the machine gun sounds are used.