What is the first action a driver of a disabled vehicle should take?

The first action a driver of a disabled vehicle should take is to place proper flares, flags, or other signaling devices around the vehicle. This is crucial for ensuring the safety of both the driver and other road users. By alerting other motorists to the presence of a disabled vehicle, the driver reduces the risk of an accident. Proper signaling devices make the vehicle visible, especially in low-light conditions or adverse weather, thereby allowing other drivers to take the necessary precautions to avoid collision.

Other options may seem practical, but they do not prioritize immediate safety. For instance, calling for roadside assistance could be important, but it should occur after ensuring that the vehicle is visible and safe for oncoming traffic. Waiting for help without taking precautions can put both the driver and passing vehicles at risk. Moving the vehicle to the shoulder is also a good idea, but it should only be done if it can be safely accomplished without further endangering the driver or other road users. Therefore, the immediate placement of flares or flags is the most critical first action in this scenario.