What type of maintenance might involve replacing LED modules?

The correct answer involves preventative maintenance because this type of maintenance is performed to prevent future failures and ensure optimal performance of traffic signal systems. Replacing LED modules during preventative maintenance is a proactive approach, which helps to extend the lifespan of the traffic signals and avoid unexpected outages or malfunctions.

In many cases, components like LED modules have a recommended lifespan and should be replaced before they fail to maintain the reliability and functionality of the traffic control system. This method of maintenance is scheduled and is part of a routine check-up or servicing plan, focusing on minimizing the risk of future problems.

Other types of maintenance, such as corrective maintenance, is typically performed in response to a failure or malfunction; emergency maintenance is unplanned and occurs during unexpected breakdowns; and operational maintenance focuses on the day-to-day tasks needed to ensure smooth functionality but does not specifically target component replacement unless failure occurs.