52 Pa. Code § 31.64
Identification of equipment regulations applicable to common carriers, the provisions of which are set forth in § 31.33 (relating to identification of equipment), also apply to motor vehicles operated by forwarders, except that the classification shall be shown as follows:
‘‘Pa. P.U.C. No. F’’
The provisions of this § 31.64 adopted April 11, 1939; amended through April 1, 1967.