Final answer:
The triage nurse will categorize this patient as Priority 2 (yellow tag) due to his injuries not being life-threatening but still requiring medical attention.
Step-by-step explanation:
The triage nurse will categorize this client as Priority 2 (yellow tag).
In the prioritization of patients in a multivehicle accident, those with serious injuries that are not life-threatening are categorized as Priority 2 (yellow tag). The young man in this case has a fracture of his right tibia and small lacerations on his face, which require medical attention but do not pose an immediate threat to his life. Therefore, he would be categorized as Priority 2.