Which of the following is NOT typically a maintenance concern for traffic signal installations?

In the context of traffic signal installations, lubrication is not typically a primary maintenance concern. Traffic signal systems are generally designed to operate without the need for regular lubrication as they rely on sealed electronic components and mechanisms that minimize wear and tear. The components involved, such as LEDs, controllers, and signal heads, are usually formed to require very little or no maintenance related to lubrication.

On the other hand, concerns like the flow of electricity are crucial because electrical faults can lead to failures in signal operation. Weather-related issues also pose significant challenges, as exposure to elements like rain, snow, wind, and extreme temperatures can affect the functionality and durability of traffic signals. Ventilation becomes relevant as well, especially in controlled cabinets where heat generated by electronic components can influence performance and longevity. All of these aspects directly relate to the operational integrity and performance of traffic signal systems, whereas lubrication is not a typical requirement in modern electronic traffic signals.