Which indicator system helps ensure the proper functioning of a bus’s turn signals?

The eight-light indicator system is crucial for ensuring the proper functioning of a bus's turn signals. This system typically includes multiple indicator lights that monitor various functions related to signaling, such as left and right turn signals, emergency flashers, and other essential light configurations.

When the driver activates a turn signal, the eight-light indicator system helps confirm that the lights are operational by providing visual feedback, which is essential for safe driving. If any of the turn signals are malfunctioning, this system can alert the driver through indicators showing the status of each light. This setup promotes safety on the road by helping to prevent accidents caused by non-functional signaling.

In contrast, the other options do not relate directly to the functionality of the turn signals. Step well lights illuminate the area where passengers enter and exit; high beam indicator lights show when the high beams are activated; and windshield wipers are for, as the name suggests, maintaining visibility during inclement weather. None of these systems monitor or indicate the status of turn signals.