Series consists of subject files of the Deputy Minister of the Department of Commercial Transport. Records relate to many different areas of the activities of department.

This series includes miscellaneous subject files along with a large number of files relating to the Canadian Conference of Motor Transport Authorities, Canadian Good Roads Association, Royal Commission of Inquiry Into Road-User Charges. The records of the Canadian Conference Motor Transport Authorities include correspondence (1959-1970), conference particulars (1964-1969), committee files, etc. The Canadian Good Roads Association records include a pavement committee file (1958), correspondence, minutes, etc. (1966).

Deputy Minister A.J. Bowering was a commissioner on two Commissions of Inquiry into Road User Charges (1958, 1960). Records of this commission have been incorporated into his record system. The commission records in this unit include correspondence, briefs, exhibits, reports etc.

This series contains weigh scale operations records. References to "Old file" numbers refer to the file classification system used by the records creator (Creator Code).