Which step comes first when dealing with an unconscious adult passenger?

When responding to an unconscious adult passenger, the first step is to ensure that the scene is safe and that danger is minimal. This is crucial because addressing an unconscious individual in a hazardous environment can pose additional risks to both the responder and the patient. Before proceeding with any medical assessments or interventions, one must ensure that there are no immediate threats, such as fire, chemicals, or other dangers that could harm the rescuer or worsen the situation.

Once the scene is deemed safe, the responder can then move on to checking for breathing, calling for help, and assessing circulation. Ensuring the safety of both the passenger and the first responder is the foundational step that allows for effective first aid to be administered without further complications.