To provide passengers with the necessary information to file a complaint, taxicabs must display a Commission-issued complaint decal which lists the telephone number and web site to be used to lodge a complaint. The decal shall be posted on the inside of the right rear window of the vehicle, along the bottom edge.
52 Pa. Code § 29.318
The provisions of this §29.318 issued under the Public Utility Code, 66 Pa.C.S. § § 501, 1102, 1103, 1501, 1502, 1504, 1506, 1508 and Chapters 23 and 25.