WVC 17 C- 15 - 14
§17C-15-14. Lamp or flag on projecting load.
Whenever the load upon any vehicle extends to the rear four
feet or more beyond the bed or body of such vehicle there shall
be displayed at the extreme rear end of the load, at the times
specified in section two of this article, a red light or lantern
plainly visible from a distance of at least five hundred feet to
the sides and rear. The red light or lantern required under this
section shall be in addition to the red rear light required upon
every vehicle. At any time there shall be displayed at the
extreme rear end of such load a red flag or cloth not less than
twelve inches square and so hung that the entire area is visible
to the driver of a vehicle approaching from the rear.