How do traffic lights work UK?
How do traffic lights work UK? In the UK, most traffic lights follow this sequence: Red - stop. Red and amber - prepare to go. Green - go (as long as the way is clear)
What are the little black cameras on top of traffic lights?
Some traffic signals have small, black devices that look similar to a camera. These are infrared sensors that are part of a “traffic preemption system” that allows emergency vehicles such as ambulances and fire trucks to safely pass through an intersection.