"flashing" isn't quite right for the motorcycle headlights. "modulating" might be a better word. If you haven't seen them maybe your state isn't full of giant female appendages who are afraid to ride a bike. Be glad.
Again, some folks love their doodads, some folks think stuff like that is stupid. There have been tons of these fads over the years. Also as TBJ said, the advantage of the 3rd brake light has not paid out. The drop in collisions is consistent with the drop in accidents of all types per miles travelled. This has been attributed to tire & brake technology. When factored against the overall decrease in accidents per mile travelled, the CHMSL is an abject failure.
At least until 2004, such a rear flashing light would have been illegal in Ohio on public roads as "flashing, oscillating, or strobe" red lights were illegal unless factory installed to draw attention to an emergency situation, like a break-down. That is why the factory lights are called hazard lights. Although frankly it is not a stretch to believe that a driver who requires such an aid as the brake light in question is in fact a hazard each time that they attempt to stop.... Maybe you can get one for your Jazzy or Hoveround, too?
