In commercial auto the ICC refers to the I.C.C. Number. This is the Interstate Commerce Commission number (docket number) that is provided to each trucking company that has been granted the authority to travel in the United States.

The use of these numbers will gradually be replaced by use of the six digit Department of Transport D.O.T. number, with no prefix, also issued to carriers. Both of these numbers are currently required to be displayed on the side of each power unit (tractor or truck).