Generally the systems that allow this have much more advanced driver attention tracking. Usually using infrared projectors and cameras aiming directly at the dr

Generally the systems that allow this have much more advanced driver attention tracking. Usually using infrared projectors and cameras aiming directly at the driver's face. Tesla is attempting to add visual driver monitoring using the interior security camera near the rear view mirror, but it doesn't have the same level of fidelity and they still require both camera attention and steering wheel torque for normal customers using their assist systems.