Solar power LED warning lights for power cable installation of traffic lights? There are other alternatives, using a solar cell as a resource for traffic lights.

Here is one example of traffic already using the LED light.

Life Time 30000-100000 hours depending on brand
Energy Saving savings s / d 80-90%
Auto LED intensity adjustment  intensity settings automatically depending on surrounding environment
Optional Housing Aluminium (AL) or Polycarbonate (PC) and light body can be      rotated 90 degrees
IP 65 Grade                                         resistant to weather disturbances such as rain, wind, snow, sand, smoke, fog, coastal environment