The Anatomy of an Illuminated Crosswalk - by silicon-constellations.com
Each road marker is solar powered and during daylight provides enough power to run the light and charge the backup battery for night or dim light operation. The backup batteries can provide up to 60 days operation, depending on the usage of the crosswalk. In deciding how many markers to use, Silicon Constellations typically gives each lane 2 markers with a final marker for near the curb. This arrangement is then duplicated on the opposite side of the crosswalk.