Automated driving systems have a range of different levels, 0 for no automation to 5 for fully self-driving. The highest level currently available and in production is Level 2. Level 2 offers controlled, automated steering, braking, and acceleration. These features keep the car traveling at a set-speed in the center of its lane.
The recommended safety measures by IIHS are designed for Level 2 systems and include escalating attention reminders, from visual to audible to physical vibration alerts. The IIHS even suggested implementing a system in case the driver does not respond to these alerts, in which the car would deploy hazard lights and slow down to a complete stop. This canceling system, once initiated, would disable automated driving for the remainder of the trip.