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 the 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.
(R.C. § 4511.131)