Trignal by Yang Yong from china

The Trignal is a self-charging LED Light that is fitted to a truck’s wheel as a hubcap. It not only glows at night, giving other motorists fair warning of the truck’s presence on the road but also visually communicates its speed. If the truck is moving at a safe pace then the wheels glow a demure green.If the driver is being rash and tardy then it glows a bright red.