Assuming that all drivers who own smartphones have enabled data-sharing, all those endpoints drifting around in traffic are sending a stream of coordinates to a central databasein real time.
"We fully support the police using technology to combat crime and terrorism, but law-abiding New Yorkers should not end up in a police database every time they walk their dog, go to the doctor, or drive around Manhattan, " Christopher Dunn, associate legal director at the New York Civil Liberty Union, said.