signalanlæg

A signalanlæg, often translated as signaling system or traffic signal system, is a set of devices used to control the flow of traffic at intersections or other points on a transportation network. The primary purpose of a signalanlæg is to enhance safety by preventing collisions between vehicles, pedestrians, and cyclists, and to improve traffic efficiency by minimizing delays and congestion.

These systems typically consist of traffic lights, which use colored lights (red, yellow, and green) to indicate when vehicles should stop, prepare to stop, or proceed. In addition to traffic lights, modern signalanlæg can incorporate various sensors such as inductive loops embedded in the road, cameras, or radar to detect the presence and volume of traffic. This information allows the signals to be activated and timed dynamically, adapting to real-time traffic conditions.

The timing of traffic signals, known as signal phasing, is a critical aspect of their operation. Signal phasing determines the sequence and duration of the green, yellow, and red lights for each approach to an intersection. Coordinated signalanlæg can link multiple intersections along a corridor to create "green waves," allowing traffic to flow smoothly for extended periods. Advanced traffic management systems can further optimize signal timing based on broader network conditions and incident detection. Pedestrian signals, audible signals for the visually impaired, and countdown timers are also common components of modern signalanlæg. The design and implementation of signalanlæg are subject to national and international standards to ensure consistency and safety.