As used in this chapter:

(1) ‘Combined weight’ means the total empty weight of all vehicles in a combination plus the total weight of the load carried on that combination of vehicles.

(2) ‘Commercial vehicle’ means a vehicle that:

(a) Is used for the transportation of persons for compensation or profit; or

(b) Is designed or used primarily for the transportation of property.

(3) ‘Department’ means the Department of Transportation. [Formerly 768.001]