Pennsylvania Statutes Title 75 Pa.C.S.A. Vehicles § 3364. Minimum speed regulation

(1) Except when reduced speed is necessary for safe operation or in compliance with law, whenever any person drives a vehicle upon a roadway having width for not more than one lane of traffic in each direction at less than the maximum posted speed and at such a slow speed as to impede the normal and reasonable movement of traffic, the driver shall, at the first opportunity when and where it is reasonable and safe to do so and after giving appropriate signal, drive completely off the roadway and onto the berm or shoulder of the highway. The driver may return to the roadway after giving appropriate signal only when the movement can be made in safety and so as not to impede the normal and reasonable movement of traffic.

(2) A pedalcycle may be operated at a safe and reasonable speed appropriate for the pedalcycle. A pedalcycle operator shall use reasonable efforts so as not to impede the normal and reasonable movement of traffic.