Researchers from the University of Washington and of California presented Automobile Driver Fingerprinting (pdf) at PETS 2016, short for Privacy Enhancing Technologies Symposium. Researchers had nearly a 90% accuracy in identifying drivers via brake pedal sensor data after only 15 minutes of driving. They used 15 drivers for their study and logged data from 16 in-vehicle sensors collected by a cars CAN (controller area-network) bus. The top sensor to fingerprint drivers was the brake pedal.”]