just wondering

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more of a stupid question. i've been driving for like 4 years now, and never drove a truck. but as i drive everyday, i usually see those delivery trucks with wide angle mirrors attached at the back of their vehicle. now my common sense tells me that it is there for a reason; to see the nearby objects that the driver could hit. but the question is, can they still see it? how about those driving a 14ft or longer trucks? or my common sense is wrong? pls. leave interesting comments! thanks