9-1-7: 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 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 signal are prohibited from using the lane over which the signal is displayed. (M.C. 1962, sec. 18.107)