Pennsylvania Statutes Title 75 Pa.C.S.A. Vehicles § 3303. Overtaking vehicle on the left

(1) The driver of a vehicle overtaking another vehicle proceeding in the same direction shall pass to the left of the other vehicle at a safe distance and shall stay to the left of the other vehicle until safely clear of the overtaken vehicle.

(2) Except when overtaking and passing on the right is permitted, the driver of an overtaken vehicle shall not increase the speed of the vehicle until completely passed by the overtaking vehicle and shall give way to the right in favor of the overtaking vehicle on suitable signal.

(3) The driver of a motor vehicle overtaking a pedalcycle proceeding in the same direction shall pass to the left of the pedalcycle within not less than four feet at a careful and prudent reduced speed.

(1) At all times when head lamps are required to be lighted according to section 4302 (relating to the period for requiring lighted lamps), an audible signal or the intermittent flashing of low and high beams except that the use of high beams shall not be permitted when a vehicle is approaching from the opposite direction within 500 feet.

(2) At all other times, an audible signal.