The term Apportioned is usually a commercial vehicle term which means that an Apportioned Vehicle that is registered in one state could be used and transported to another state without any changes in its commercial license or number. This the term mostly used in the trucks and other passenger vehicles that provides commute services between the two states' jurisdictions.

It is a commercial vehicle number plate that means the following vehicle has paid a fee to every state in which they drive. The trucks you see run in the roads don’t often pay taxes just too single state where they originally belong too. Transport authorities also issue Apportioned Cab Card to the vehicles that provide cab services between two states. The truck owners who often need to take their truck from one state to another need to pay separate taxes to every state. This is one of the standard rules and procedures of the US transportation governed by the highest transport authority.