GLASGOW, SCOTLAND - MARCH 16:  A number plate recognition camera, operated by the UK's Driver and Vehicle Licensing Agency, scans the M77 motorway for vehicles with invalid road tax on March 16, 2005 in Glasgow, Scotland.  Stingray automatic number plate readers collect images of unlicensed moving vehicles from digital cameras. The whole process of detection and data capture takes a fraction of a second. Stingray is capable of working day and night with vehicle speeds in excess of 100 mph.  (Photo by Christopher Furlong/Getty Images)