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

Lubrication is not typically considered a primary maintenance concern for traffic signal installations. Traffic signals are mainly mechanical and electrical systems, where the critical aspects of maintenance focus on ensuring the electrical components function correctly and respond appropriately to control systems.

The flow of electricity is crucial, as electrical failures can lead to non-operational signals or unexpected behavior. Weather-related issues also significantly impact traffic signal reliability; exposed electrical components can be damaged by moisture, ice, or extreme temperatures, requiring maintenance attention. Ventilation could also be relevant as it helps prevent overheating in signal controllers that could jeopardize operational efficiency.

In contrast, while lubrication is essential in many mechanical applications, traffic signal installations usually do not involve components that require frequent lubrication to maintain operation. Most systems are designed to operate effectively with minimal mechanical friction, meaning that lubrication is not a significant concern for the everyday maintenance of traffic signals.