Both yourself and
@LosAltosChuck are saying the same thing about receptive users. L3 still can require a user to intervene at a moment's notice. If you have headphones on and are watching a movie, it's not guaranteed that you are still receptive to a situation where you need to intervene. Likewise, you can't be sleeping.
no we are not. in L3 you don't monitor the car, ads, or the road. you can watch movies, text, email, browse, videos, phone, games.
LosAltosChuck is saying otherwise.
You are however need to be aware (not sleeping) and to notice apparent VEHICLE FAILURE.
In a vehicle failure you will know that there is a vehicle failure. its obvious. you will hear and feel a tire blowout or a tire rod pop out no matter what you are doing other than maybe sleeping.
but that doesn't mean the vehicle won't alert you or that the ADS suddenly turns off if you had a tire blowout or tire rod popped out. just that you need to be awake (receptive) and not sleeping.
EXAMPLE 3: A vehicle with an engaged level 3 ADS experiences a broken tie rod, which causes the vehicle to handle very poorly giving the fallback-ready user ample kinesthetic feedback indicating a vehicle malfunction necessitating intervention. The fallback-ready user responds by resuming the DDT, turning on the hazard lamps, and pulling the vehicle onto the closest road shoulder, thereby achieving a minimal risk condition
This is why you can't SLEEP in a L3.
The SAE makes a clear distinction.
There is no saying the same thing. There is no agree to disagree.
NOTE 2: Recognizing requests to intervene issued by a driving automation system is not a form of monitoring driving automation system performance, but rather a form of receptivity.
NOTE 3: At levels 1-2, the driver monitors the driving automation system’s performance .
NOTE 4: At higher levels of driving automation (levels 3-5), the ADS monitors its own performance of the complete DDT.
Receptive User = Not Sleeping.
SAE defines it as:
3.18 RECEPTIVITY (OF THE USER) An aspect of consciousness characterized by a person’s ability to reliably and appropriately focus his/her attention in response to a stimulus.
- - The driver state or condition of being receptive to alerts or other indicators of a DDT performance-relevant system failure, as assumed in level 3, is not a form of monitoring. The difference between receptivity and monitoring is best illustrated by example: A person who becomes aware of a fire alarm or a telephone ringing may not necessarily have been monitoring the fire alarm or the telephone. Likewise, a user who becomes aware of a trailer hitch falling off may not necessarily have been monitoring the trailer hitch.
- - By contrast, a driver in a vehicle with an active level 1 ACC system is expected to monitor the driving environment and the ACC performance and otherwise not to wait for an alert to draw his/her attention to a situation requiring a response.
AUTOMATED DRIVING SYSTEM (ADS) The hardware and software that are collectively capable of performing the entire DDT on a sustained basis, regardless of whether it is limited to a specific operational design domain (ODD); this term is used specifically to describe a level 3, 4, or 5 driving automation system.
ADS (while not engaged):
• Permits engagement only within its ODD ADS (while engaged):
• Performs the entire DDT
• Determines whether ODD limits are about to be exceeded and, if so, issues a timely request to intervene to the DDT fallback-ready user • Determines whether there is a DDT performance-relevant system failure of the ADS and, if so, issues a timely request to intervene to the DDT fallback-ready user
• Disengages an appropriate time after issuing a request to intervene
• Disengages immediately upon driver request
There is a reason L3 cars have things like redundant brakes, steering and redundant computer systems.