They measure torque on the wheel from the drivers hand. It is possible to fool via defeat devices etc (ex www dot autopilotbuddy dot com). There is a WIP syste

They measure torque on the wheel from the drivers hand. It is possible to fool via defeat devices etc (ex www dot autopilotbuddy dot com). There is a WIP system that uses the selfie camera to monitor the driver but it's still possible to fool (image taped in front or block it with tape etc) so unlikely it can catch all cases of drivers being willfully being dangerous. https://twitter.com/greentheonly/status/1379928419136339969 https://twitter.com/greentheonly/status/1379928419136339969