after the course where i run we have a minimum of 6 hours of nothing but drive an out of service ambulance. this is to get the driver used to the area. then you are paired up with drivers to show you what is actually done while an emergency is happening,(driving, parking and etc). then and only then can you be approved to drive where i am.
besides in PA you don't need a commercial license. all you need is for someone to say you can drive