The primary function of the CMU is:

The primary function of the Central Monitoring Unit (CMU) is to prevent conflicting signal indications. This is crucial in traffic signal systems, where multiple signals could potentially conflict, leading to safety hazards. The CMU is responsible for monitoring the status of various signals and ensuring that only one signal provides a specific instruction at any given time, thereby reducing the risk of accidents and improving traffic flow.

By coordinating the operations of different traffic signals and managing their timing and phases, the CMU plays a vital role in maintaining orderly and safe intersections. This monitoring capability is essential for effective traffic control, allowing for the efficient handling of vehicular and pedestrian movements. The CMU's ability to prevent conflicts ensures that safety is prioritized, which aligns with the overall goals of traffic management systems.