I don’t know, but mine guesses correctly when I’m a passenger about 90% of the time. Unlike the other commenter, mine doesn’t have a bluetooth connection to my car or a device in my car.

Once in a while I have to tell it I’m not driving.

There’s an app installed on your phone and a separate bluetooth device you keep in your car.

By default, it assumes you’re the driver of your car, but you can use the app to claim someone else was driving your car during a particular trip.

If you’re in someone else’s car, the app assumes you’re not driving because the bluetooth device in your car isn’t nearby.

My car can detect if there’s someone in the passenger seat, and sends an alert if they didn’t fasten their seat belt.