Sasless.
I know nothing of the terrain, but given that the USA is so much larger than UK etc. Are the incidence of EMS crashes proportional to the cities more air traffic, greater workload, building etc. Or are the same criteria relevant to the rural incidents, and that terrain situational awareness fatigue: have as much relevance to all.
to simplify. Are there faults common to rural and others common to surburbian ems crashes.