What is an actuated signal in the context of traffic systems?

An actuated signal is a type of traffic signal that adjusts its timing based on real-time conditions, specifically vehicle presence at the intersection. Sensors, which can be embedded in the roadway or use other technologies such as cameras or radar, detect the presence of vehicles waiting at the signal. When vehicles are detected, the signal can extend green times, reduce red times, or trigger other operational changes to manage traffic flow more effectively.

This dynamic operation helps in optimizing traffic movement and can reduce congestion, wait times, and improve safety for both vehicles and pedestrians by ensuring that light changes occur as needed based on actual traffic conditions rather than relying on fixed timings. The ability to respond to real-world conditions makes actuated signals an effective tool in traffic management.