75 Pa.C.S. § 3523: Operating motorcycles on roadways laned for traffic.

(a) Right to use of lane.--All motorcycles are entitled to full use of a lane and no motor vehicle shall be driven in such a manner as to deprive any motorcycle of the full use of a lane.

(b) Overtaking and passing.--The operator of a motorcycle shall not overtake and pass in the same lane occupied by the vehicle being overtaken.

(c) Operation between lanes or vehicles.--No person shall operate a motorcycle between lanes of traffic or between adjacent lines or rows of vehicles.

(d) Limitation on operating abreast.--Motorcycles shall not be operated more than two abreast in a single lane.

(e) Limited access highways.--No motorized pedalcycle shall be operated on any limited access highway.

(f) Exception for police officers.--Subsections (b) and (c) do not apply to police officers in the performance of their official duties.