What maintenance action is crucial for signal lenses?

Regular cleaning of signal lenses is crucial for maintaining visibility and ensuring that the signals are clearly seen by drivers and pedestrians. Over time, lenses can accumulate dirt, grime, and other contaminants that can obscure the light being emitted. If the lenses are not cleaned regularly, it can lead to reduced visibility, potentially causing misunderstandings or accidents at intersections.

Maintaining visibility through clean lenses ensures that the signals function as intended, thereby enhancing safety and compliance with traffic regulations. While regular inspections for damage and the replacement of old lenses are important actions, the operational effectiveness of signals directly relies on cleanliness to allow proper illumination. Adjusting signal timing is more about traffic flow management than the physical upkeep of the signals themselves. Thus, keeping the lenses clean is the most immediate and crucial maintenance task.