I've already seen likely malfeasance from the traffic overrides used to help emergency vehicles (in the US) control traffic lights. When the override is activat

I've already seen likely malfeasance from the traffic overrides used to help emergency vehicles (in the US) control traffic lights. When the override is activated, a white light turns on near the traffic light. I've seen that go on in heavy traffic when there were no obvious emergency vehicles present. Another time I was in heavy traffic and held up for about an hour because a parked police car had left their traffic light override turned on, causing the light not to cycle.