313.04  SIGNAL TO CONTROL LANE DIRECTION OF TRAVEL.
   When lane-use control signals are placed over individual lanes of a street or highway, these signals shall indicate and apply to drivers of vehicles as follows:
   (a)   A Steady (Downward) Green Arrow.  Vehicular traffic may travel in any lane over which a green arrow signal is shown.
   (b)   A Steady Yellow "X".  Vehicular traffic is warned to vacate in a safe manner any lane over which such signal is shown to avoid occupying that lane when a steady red "X" signal is shown.
   (c)   A Flashing Yellow "X".  Vehicular traffic may use with proper caution any lane over which this signal is shown for only the purpose of making a left turn.
   (d)   A Steady Red "X".  Vehicular traffic shall not enter or travel in any lane over which this signal is shown.
(ORC 4511.131)
Penalty - see Sections 307.01 and 307.02