Fire Fighters at Collisions?

My department's custom is that we conduct triage on the victims. This means es their injuries and determine wether they can be moved before EMS or ambulances arrive. If they can wait until the ambulances arrive to be moved and boarded. Another task we do is secure the vehicles to make sure there is no fuel leaks or any other hazards. We do not direct traffic, we leave that to law enforcement. Once the victims are transported and the vehicles are secured we try to leave as soon as posssible so we can get our trucks and people out of harms way. Some jurisdictions may be different but that is the way we do it.