http://www.washingtontimes.com/news/2019/jan/9/flagstaff-arizona-rolls-out-voluntary-program-to-r/

Amid concerns of Big Data tracking people's movements, an Arizona city has launched a program to track its residents' movements in the name of reducing traffic congestion.

Officials in Flagstaff say participation in the program is voluntary and anonymous. It relies on cellphone location data that's collected and analyzed by a private company, which then sells the information to transportation officials to operate the program.