For vehicles weighing over 11,794 kg, the excess of the value of your vehicle over the basic plate coverage can be covered off either with your plate insurance or on a commercial auto policy. Excess value coverage is typically less expensive on a commercial auto policy vs on a plate registration. For example, if a heavy vehicle basic plate provides $15,000 and the vehicle is worth $100,000, then $85,000 needs to be insured as excess either under the plate registration or on a commercial auto policy.