What is the first action a driver of a disabled truck or bus should take?

The first action a driver of a disabled truck or bus should take is to set out flares, fuses, or reflectors. This step is crucial for ensuring the safety of the driver and other road users. By marking the location of the disabled vehicle, it increases visibility and alerts oncoming traffic to the potential hazard. This proactive measure helps prevent accidents by allowing drivers to see that there is a disabled vehicle ahead, enabling them to prepare for any necessary evasive maneuvers.

In situations involving a disabled vehicle, it's essential to prioritize safety before taking additional steps such as calling for assistance or attempting to change a tire. While waiting for roadside help may also be necessary, the immediate action is to create a safe environment around the vehicle, which is why the placement of warning devices is critical.