This past Saturday at Lincoln Speedway (PA) we had a driver injured. They always have two staffed ambulances at the track one in the pits and one grandstand area. As they left with the driver a third ambulances was pulling into the track. Just as they were about to push the cars back off a call comes in for an injured fan (kid) in the stands. All EMTS responded. Even though there was still an ambulance and fire crew in the pits no cars moved until the EMTS returned to the Pits. No car moves unless they have a staffed ambulance in the pits.