52 Pa. Code § 30.52 – Commencement of complaints.

(a) Formal complaints filed under this chapter alleging violations of 66 Pa.C.S. Chapter 24 (relating to taxicabs in first class cities) or this title shall be submitted consistent with § § 5.21—5.24 (relating to formal complaints).
(b) Formal complaints filed under this subchapter will be considered public complaints if filed by the Commission, Commission enforcement officers, the City of Philadelphia or driver licensing agents.
(c) Formal complaints filed under this subchapter will be considered private complaints if filed by a member of the public other than those parties described in subsection (b).

This section cited in 52 Pa. Code § 30.53 (relating to answers to complaints); and 52 Pa. Code § 30.55 (relating to default orders).