Why use storage batteries for the in-road lights, rather than solar cells?
Current commercially-viable technology solar panels are too brittle for in-road use, and do not produce enough power for the SafeZone lights (given the size of the light) to permit their use. The latest generation of storage cells provide a solution that allows them to operate for several hours a day, for a number of years, before they need replacing. However, the road-side controller system can be fitted with solar panels, provided there is adequate sunlight where they are situated.
