What is the purpose of using overhead amber lights when approaching a bus stop?

The purpose of using overhead amber lights when approaching a bus stop is to give drivers a warning to slow down. This serves as a precautionary measure, alerting other drivers that a school bus is preparing to make a stop. The use of amber lights helps to ensure the safety of children entering or exiting the bus, signaling to oncoming traffic that they should reduce their speed and be prepared to stop. This warning is crucial, especially in areas where children may be present and crossing the roadway.

The other options may not accurately reflect the function of the amber lights. For instance, signaling it is safe to pass or indicating bus maintenance needed do not align with the primary purpose of the amber lights. Instead, their main role is to promote safety by signaling a cautionary state to surrounding drivers.