An example of emergency maintenance for traffic signals is?

Answer: C — Power outages/surges due to electrical storms

Emergency maintenance for traffic signals is primarily concerned with addressing situations that can suddenly disrupt the functionality of the signals, posing hazards to traffic safety and efficiency. Power outages or surges, especially those caused by electrical storms, represent such emergencies. When a power outage occurs, it can lead to non-functional traffic signals, increasing the risk of accidents as drivers are left without guidance at intersections. Timely restoration of power or immediate repairs to the system are essential to mitigate these risks and ensure safe traffic flow. In contrast, routine checks for wear and tear, upgrades of signal software, and systematic replacements of bulbs are planned maintenance activities. These tasks are performed proactively to maintain the system's efficiency rather than in response to an immediate crisis. While they are critical for the long-term functionality of traffic signals, they do not qualify as emergency maintenance, which specifically addresses urgent, unforeseen circumstances requiring immediate action.