[CamouflagedKiwi]

From what I've heard, they don't always use the sensors; sometimes they're on a fixed schedule during the day and on request only overnight. Or they might be a fixed schedule always; a classmate at uni did a project around modelling traffic flow and found an intersection or two that turned out to be configured differently from how the council expected; probably a setting that was changed once and never revisited.

[jeroenhd]

I've seen this happen as well, but on different time slots. I think some of it is intentional (the algorithm designed to regulate busy intersections across an entire main road probably doesn't work well when there are only a few people on the road). The ones that operate on a timer all day every day seem to be bugged out, though.