States Monitoring Drivers by Tracking Cell Phones
Several state transportation agencies, including those in Maryland
and Virginia, are starting to test technology that allows them to
monitor traffic by tracking cellphone signals and mapping them
against road grids. The technology underlines how readily cellphones can become tracking devices for private companies, law enforcement and government agencies.
Enlisting Cellphone Signals to Fight Road Gridlock, New York Times, November 11, 2005.
