Which situation may require maintenance on a traffic signal?

Traffic accidents that damage equipment is indeed a situation that may require maintenance on a traffic signal. When an accident occurs, it can physically impact the structure, signals, wiring, or associated equipment of the traffic signal system. This type of damage necessitates an inspection and possible repair or replacement of the affected components to ensure the traffic signal operates correctly and safely.

While other options may also involve maintenance under certain circumstances, they do not directly imply an immediate need for maintenance in the same way that damage from accidents does. For example, regular schedule maintenance is part of standard operating procedures but does not inherently stem from an unplanned incident. The installation of additional traffic lights may require adjustments or enhancements to the existing system, but it is typically part of a planned project rather than a repair situation. Similarly, seasonal weather changes may influence maintenance schedules, but they do not inherently cause damage that would necessitate immediate repairs.