How should the driver respond if the low air warning system activates?

When the low air warning system activates, it indicates that the air pressure in the vehicle's air brake system is dropping to a level that may compromise the effectiveness of the brakes. This warning is crucial for the safety of both the driver and other road users. Pulling over safely and checking the air pressure allows the driver to assess the situation before any further action is taken. It is essential to ensure that the air pressure is within a safe operating range to guarantee that the vehicle's braking system remains functional.

If the driver were to maintain speed and observe traffic, as suggested in one of the options, this could lead to a dangerous situation in which the braking system fails while on the road. Turning on hazard lights and continuing to drive would also be inappropriate, as it fails to address the underlying issue of low air pressure, potentially leading to brake failure. Ignoring the warning altogether is risky, as a stable-feeling vehicle may not reflect the actual condition of the brakes, which could pose serious safety hazards. Therefore, the correct and safest action is indeed to pull over and check the air pressure.