What is the function of air storage tanks in a bus?

The function of air storage tanks in a bus is to contain compressed air. This compressed air is essential for operating various systems within the bus, particularly the air brake system. When the bus is in operation, the air storage tanks store the compressed air generated by the bus's air compressor, which is used to apply the brakes and engage other pneumatic systems such as door actuators and suspension components. The availability of stored compressed air ensures that these systems can function effectively and reliably, contributing to the overall safety and performance of the bus.

While other options may relate to bus operation in indirect ways, they do not accurately describe the role of air storage tanks, which is solely focused on the management of compressed air for vital vehicle functions.