§ 1122. Overtaking a vehicle on the left. The following rules shall
govern the overtaking and passing of vehicles proceeding in the same
direction, subject to those limitations, exceptions, and special rules
hereinafter stated:

(a) The driver of a vehicle overtaking another vehicle proceeding in
the same direction shall pass to the left thereof at a safe distance and
shall not again drive to the right side of the roadway until safely
clear of the overtaken vehicle.

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