WVC 17 C- 15 - 35
Every motor vehicle which is so constructed or loaded as to
obstruct the driver's view to the rear thereof from the driver's
position shall be equipped with a mirror so located as to reflect
to the driver a view of the highway for a distance of at least
two hundred feet to the rear of such vehicle.
Note: WV Code updated with legislation passed through the 2012 1st Special Session