6-2-3-3: LANE CONTROL SIGNALS:
Whenever lane control signals are used in conjunction with official signs, they shall have the following meanings:
   A.   Opaque arrow on green, green arrow on opaque background, or green arrow alone: Drivers of vehicles facing such signals are permitted to use the lane or lanes over which the signal is displayed providing that no intersection traffic control signal gives a stop indication affecting the lane or lanes involved.
   B.   Opaque "X" on red, red "X" on opaque background, or red alone: Drivers of vehicles facing such signals are prohibited from using the lane over which the signal is displayed. (Ord., 6-5-1973)