Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 195 - TOW TRUCK IDENTIFICATION SIGNS
Section 195.3 - Sign standards

(a) General rule. A wrecker used commercially to tow motor vehicles shall have the name of the business or person operating the wrecker designated on each side of the wrecker in a prominent location in letters not less than 3 inches high. The name may be printed on the wrecker or may be contained on signs affixed to the wrecker.

(b) Exception. The signs on a wrecker having otherwise acceptable signs on August 1, 1981 may have letters less than 3 inches, but at least 2 inches high.