Comment Not particularly new (Score 1) 314
It's common knowledge here in the San Francisco bay area, that the google maps traffic progress data is largely based on pickups of people's ezpass information along the highway at various points. This allows them to estimate flow by seeing how long it takes for cars to go from given points along the highway, which lets them determine if the highway is operating at reduced speeds.
Many people do not keep their ezpass available. Some do. Generally people seem happy that some tracking occurs to provide the public with a useful service.
Maybe that's the key difference. If NYC was providing realtime data to the public as a result, the public opinion would probably be different.