What is the purpose of a tether in traffic signal control systems?

The purpose of a tether in traffic signal control systems is to add stability to the signal head. When traffic signals are exposed to wind or other forces, the tether helps to secure the signal head in place, preventing it from swinging or tilting. This stability is crucial for maintaining proper visibility and functionality of the traffic signals, ensuring they can effectively convey information to drivers. A well-secured signal head can reduce the risk of failure or misdirection, ultimately enhancing overall traffic safety.

While energy efficiency, visibility enhancement, and wear reduction are important factors in traffic signal systems, they do not directly relate to the specific role of a tether, which is primarily to provide physical stability.