Here's how you can tell so that you don't get confused as easily in future. Level 3 cars can require the occupant to drive the vehicle, "When the feature requests: You must drive the car". Waymo even offers service to people who cannot drive whether that's legally (they aren't licensed) or physically (blind people can use Waymo but can't drive a car). They are simply not required to take over driving.
Here's how you can tell so that you don't get confused as easily in future. Level 3 cars can require the occupant to drive the vehicle, "When the feature requests: You must drive the car". Waymo even offers service to people who cannot drive whether that's legally (they aren't licensed) or physically (blind people can use Waymo but can't drive a car). They are simply not required to take over driving.