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Allstate spinoff Arity uses cellphone data to be high-tech backseat driver
In the auto insurance world, Gary Hallgren is Big Brother, watching more than a million drivers every day to determine who is likeliest to have an accident.
Hallgren is president of Chicago-based Arity, a year-old Allstate tech startup that uses smartphone apps and add-on devices to track every move drivers make behind the wheel.