The latest Tesla software update version 8.0 strengthens the abuse protection against improper use.

After a few minutes of driving with Autopilot's Autosteer engaged, the system sends visual and later audible signals to prompt users to keep their hands on the wheel.

If the car still does not detect wheel contact after a series of three warnings, the car will shut down the Autosteer for the remainder of the trip.

To re-engage Autosteer, the driver is then required to stop and switch to park mode, prior to reactivation.

"We take a quick look at how long before Autopilot notifies you to put your hands on the wheel. Also, what warnings you would need to ignore for Autosteer to be Unavailable."

source: Teslarati