If mechanical devices are mounted on both sides of a motor vehicle which, when activated by the driver, provide traction by deploying a chain of metal cross members under a tire while the vehicle is in motion, the:

1. 1. Cross members must extend across at least 85 percent of the width of the tire; and
2. 2. Devices may be used only upon the drive axles of the vehicle.

(Added to NRS by 1987, 1343)—(Substituted in revision for NRS 484.6436)