BostonBTS writes "IntelliOne Technologies has just launched a real-world test of Need4Speed, a real-time traffic-monitoring system that tracks drivers' cell phones. From their website: 'Unlike any other solution available today, the IntelliOne Roadway Speed Measurement System produces live roadway speeds for all highways and surface streets where mobile phone coverage exists, accurate to within three miles per hour.' Of course, any compulsory phone-tracking system raises privacy concerns. According to an article on LiveScience, 'the personal identification data of users will be stripped from cell phone signals before they are processed by IntelliOne's software.' The cell phone companies have this data, but IntelliOne says they won't be keeping their copy."