Comment by bobthepanda

I mean, we saw this when traffic disappeared during COVID and red light running shot up significantly. https://info.oregon.aaa.com/why-did-crashes-spike-during-cov...

Car detection is certainly not a standard feature of stoplights in the US, and they represent an ongoing expense since you have to maintain the detection loops, pay an outside vendor for software to maintain and modify stoplights, etc. A roundabout is more or less installed and done.