What should a driver do if they notice a flashing red light in the cab?

When a driver notices a flashing red light in the cab, it typically signifies an alert or warning condition that requires immediate attention. Investigating a possible open compartment is crucial because it directly relates to safety and operational integrity. If a compartment is open while the vehicle is in motion, it may pose not only a safety risk to the driver and passengers but also to surrounding vehicles and pedestrians. Ensuring all compartments are securely closed maintains the safety of the vehicle’s operation.

The other options do not directly address the immediate action needed when a red light is flashing. Continuing to drive without addressing the warning could lead to dangerous conditions. Checking the fuel level does not pertain to the flashing light context and may not be a priority at that moment. Preparing for a sudden stop may be valid in certain scenarios, but it primarily diverts focus from determining the cause of the warning, which is vital for ensuring safe operations. Thus, investigating the possible open compartment is the most appropriate and immediate response to the situation indicated by the flashing red light.