Trignal by yong yang from china
designer's own words:
This is a self charging plugin for wheels. It generate the power by revolve with the wheel. And the power to run the LED signal.
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.
This is a self charging plugin for wheels. It generate the power by revolve with the wheel. And the power to run the LED signal.
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.
This is a self charging plugin for wheels. It generate the power by revolve with the wheel.