§ 1116. Lane-use control signal indications. Whenever traffic is
controlled by lane-use control signal indications located over the
individual lanes of a highway, only the colors green, yellow, white and
red shall be used, and said signals shall indicate and apply as follows:

(a) Traffic facing a steady downward green arrow signal indication is
permitted to drive in the lane over which the arrow signal indication is
located.

(b) Traffic facing a steady yellow X signal indication shall prepare
to vacate the lane over which the signal indication is located because a
lane control change is being made to a steady red X signal indication.

(c) Traffic facing a steady white two-way left-turn arrow signal
indication is permitted to use a lane over which the signal indication
is located for a left turn, but not for through travel, with the
understanding that common use of the lane by oncoming road users for
left turns is also permitted.

(d) Traffic facing a steady white one way left-turn arrow signal
indication is permitted to use a lane over which the signal indication
is located for a left turn (without opposing turns in the same lane),
but not for through travel.

(e) Traffic facing a steady red X signal shall not use the lane over
which the signal indication is located and this signal indication shall
modify accordingly the meaning of other traffic controls present.