If it isn't already planned, it would be great to implement the figure of a nurse at the emergency department entrance that assign priority codes (red, yellow, green /priority 1 2 3) to patients. And patients with high will be treated first.
The most two used systems are colors and number. Colors are used also in hospital, not only in mass casualty or ambulance dispatch. Eg. a miocardial infarction is a red code/priority 1. In the picture there is an example of a colour and numeric triage.
It could be interesting, because in the game, if I'm expecting a red code, I'll keep free my shock room and my best doctors
120 minute wait time in ER, ouch. Almost all hospitals in my state have wait times under an hour. The triage system looks interesting though and I definitely think it would add more depth and immersion into the game.