How does AutoGreen work?
Find out how AutoGreen uses advanced detection and artificial intelligence to manage traffic through two-way roadworks.
AutoGreen combines advanced radar detection with intelligent signal control.
Monitoring approaching traffic
AutoGreen-compatible signals use Frequency Modulated Continuous Wave radar, usually shortened to FMCW radar.
Unlike basic Doppler detectors, which mainly identify movement, FMCW radar provides more detailed information about the traffic approaching the signals. Depending on the system, it can detect several vehicles and provide information about their position.
This helps AutoGreen understand whether vehicles are approaching, waiting or forming a queue.
Responding to traffic conditions
AutoGreen uses the information from the detectors to adjust signal operation.
When traffic increases, AutoGreen can respond to demand while continuing to protect the overall signal cycle. Each approach is given an opportunity to move, helping traffic clear through the shuttle lane.
This is different from simply entering a very long maximum green time. Long green times in standard VA mode can allow vehicles to continue entering the shuttle lane while traffic is already backing up from the other end.
Managing congestion
If congestion begins to develop, AutoGreen automatically changes the way the signals respond. It aims to prevent the problem from becoming worse and helps the site recover without an operative having to control every signal change manually.
AutoGreen and manual control
AutoGreen can reduce the need for manual control at many two-way sites. This may provide several benefits:
- Fewer operatives working beside live traffic
- Reduced exposure to poor weather, pollution or abuse
- More consistent signal operation
- Lower site management costs
- Automatic traffic management throughout the day and night
Whether AutoGreen can be used instead of manual control depends on the site design, traffic levels, nearby junctions and any permit or authority conditions.
Critical or particularly busy sites may require a different control method, such as Urban Traffic Control. See the TGS AutoGreen guidance.