The patented WeedSeeker® technology uses advanced optics and computer circuitry to sense if a weed is present. When a weed enters the 12"-wide field of view of the Sensor, it signals a spray nozzle to deliver a precise amount of herbicide. The WeedSeeker® will spray only weeds, not bare ground. The WeedSeeker® is effective wherever weeds occur intermittently. 
It is being used along roadsides, along irrigation areas ,foot paths, and on railway lines.  Other uses include airport runways, golf courses, paved parking lots with medians, Tarmac and gravel parking lots, parks and hiking trails, forestry  and in many agricultural / horticultural applications also. The possibilities are limitless.