"improper use of headlights"

Squishy wrote: The full subsection reads: "No person shall use highbeam headlamps that produce alternating flashes of white light on any vehicle other than a vehicle referred to in subsection (1). R.S.O. 1990, c. H.8, s. 169 (2)."

Vehicles referred to in (1) are "a public utility emergency vehicle while responding to an emergency and by an emergency vehicle as defined in subsection 144 (1)."

No mention of "when headlights are required," although subsection (1) does say "despite [section which does only apply when lamps are required]". However, since (1) is the subsection allowing a certain action, I take subsection (2) to apply at all times. What isn't clear is what the heck "alternating" means (between sides, or between on/off?).