What phase of an EMS response are you in when you report that you are on your way to a vehicle collision?

The appropriate phase of an EMS response when you report that you are on your way to a vehicle collision is "En route to the scene." This phase signifies that you are in transit, heading towards the location of the incident where you will provide assistance.

During this phase, communication is vital, as it allows for coordination with other responders and an assessment of potential hazards or necessary resources needed upon arrival. Being en route indicates that you are mobilizing your equipment and set to deliver emergency medical care, but you have not yet arrived at the scene to initiate those actions.

The other phases refer to different moments in the EMS response process. Being "At the scene" refers to when you have arrived and are actively providing care. "Post-incident debriefing" occurs after the incident, where responders discuss the event to learn or improve future responses. "Transfer of care" happens when you hand over the patient to another medical professional or facility, signifying the completion of your responsibilities as the initial responder.