What color of lamps is required for signal warning lamps on all school buses?

The correct response to the question about the color of signal warning lamps required on all school buses is that they must be amber and red. This color scheme is significant for safety regulations, as it helps in clearly communicating the presence of a school bus and the actions of its drivers to other roadway users.

Amber lights are used to indicate when a school bus is preparing to stop for picking up or dropping off children, giving drivers a warning that they should slow down and be cautious. When the bus extends its stop sign and the red lights are activated, it signals that children are either boarding or leaving the bus, and all vehicles must come to a complete stop to ensure the safety of the children. This visual signal is a critical component of traffic safety, designed to protect students and minimize the risks associated with school bus operations.

Choosing any other color would not convey the same urgency and recognition among drivers, which is why amber and red are specifically mandated for school buses.