Yes, they detect vehicles and pedestrians. The one facing down towards the pavement detects if a pedestrian walks away after pressing the button, and cancels the lights changing.
People Also Ask
Pedestrian sensors are technologies that can be installed at road intersections to detect whether and how many pedestrians are waiting to cross the road.
Inductive-Loop SensorsInductive-loop traffic detectors use an electrically conducting loop embedded in the pavement to send a signal to the traffic control system to indicate the presence of a vehicle. The traffic control system can then change the signal to allow the traffic to pass through the intersection.