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(a) Notwithstanding the prima facie speed limits, any vehicle proceeding upon a highway at a speed less than the normal speed of traffic moving in the same direction at such time shall be driven in the right-hand lane for traffic or as close as practicable to the right-hand edge or curb, except when overtaking and passing another vehicle proceeding in the same direction or when preparing for a left turn at an intersection or into a private road or driveway.
(b) If a vehicle is being driven at a speed less than the normal speed of traffic moving in the same direction at such time, and is not being driven in the right-hand lane for traffic or as close as practicable to the right-hand edge or curb, it shall constitute prima facie evidence that the driver is operating the vehicle in violation of subdivision (a) of this section.
This is a pretty typical law - I know that PA has pretty much the same code. Doing a little quick research, State "keep right" laws - you can see that most states (31/50) have the exact same laws. Six states (IL,KS,KY,ME,MA,NJ) actually forbid use of the left lane, and two states (PA, WA) have a slight ban on the using the left. The rest of the states have no specific law, though all of these states require you not to obstruct the flow of traffic.