ok, now first off, we have 2 full time EMT's that are on duty from about 700 to about 1600 hours on the weekdays. during weekends, evenings, what have you... it's whoever answers the pager, and to my knowledge, we've not missed a call that often. though it may be different in each area. another thing is that alot of times, there's only 2 EMT's on the rig for most runs; one driving, one in back with the patient. and that seems to work out fine for us.