67 Pa. Code § 175.177
(b) Rearview mirrors. A vehicle specified under this subchapter shall be equipped with at least one rearview mirror or similar device. If a certificate of exemption for a sun screening device or other material has been issued, rearview mirrors, each with a minimum reflective surface of 12 1/2 square inches for a flat mirror or 10 square inches for a convex mirror, shall be installed on both sides of a motor-driven cycle or motorized pedalcycle. A vehicle for which a certificate of exemption has been issued for medical reasons may be equipped with only a left outside rearview mirror, unless originally equipped with an outside rearview mirror on both sides of the vehicle.
The provisions of this § 175.177 amended under the Vehicle Code, 75 Pa.C.S. § § 4103, 4521, 4524, 4703 and 6103.
The provisions of this § 175.177 adopted October 29, 1982, effective February 1, 1983, 12 Pa.B. 3862; corrected November 12, 1982, effective February 1, 1983, 12 Pa.B. 3947; readopted December 2, 1988, effective December 3, 1988, 18 Pa.B. 5362; amended September 27, 1996, effective September 28, 1996, 26 Pa.B. 4640. Immediately preceding text appears at serial pages (132944) to (132945).