31 C.F.R. § 0.209 Use of Government vehicles.
Title 31 - Money and Finance: Treasury
Employees shall not use Government vehicles for unofficial purposes, including to transport unauthorized passengers. The use of Government vehicles for transporting employees between their domiciles and places of employment must be authorized by statute (See, e.g., 31 U.S.C. 1344).
Title 31: Money and Finance: Treasury
PART 0—DEPARTMENT OF THE TREASURY EMPLOYEE RULES OF CONDUCT
Subpart B—Rules of Conduct
§ 0.209 Use of Government vehicles.