The two different licenses are used to show what sort of vehicles the owner can drive. A DZ license enables a person to legally drive things like a refuse or dumper truck. The AZ license does not.
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An AZ license allows you to drive a tractor-trailer or other combination vehicle over a certain weight limit. A DZ license allows you to drive a straight truck or other vehicles exceeding a certain weight limit but not considered as a tractor-trailer combination.