1) If an operable, but safety related issue is detected, restrict the driving destinations to either the repair shop or the hospital (you know, the repair shop for those organic units) and drive with the hazard lights on.
My GPS doesn't know about entire streets. Apple Maps doesn't know about entire cities. What if I pick a destination that is a hospital or repair shop that it doesn't know about? What if the only one it does know about is closed or is tens of miles further away? You're adding new liability in order to guard yourself against liability
2) Not the manufacturer's fault... hardware failures happen; if it's that critical then call a taxi (budgeting enough time is YOUR responsibility).
I'm not sure a judge is going to listen to that argument if he believes that the only reason the detector that failed was added to the car is because the manufacturer didn't want to potentially lose a court case over a broken taillight.
3) Legally disallow tickets for equipment violations on the way to the repair shop.
Step back and look at the big picture here. We're making a lot of changes here (paying for broken taillight detectors and hundreds of other detectors to be installed, adding other laws that have their own wrinkles) in order to save on a few court appearances where a car owner tries to pass on the blame for his ticket. Cases that the car owner may lose anyway and therefore would have solved themselves fairly
4) The car would get authorization from you before setting off. If you are home alone and need to go to the hospital ASAP, call 911.
Then my medical insurance company is probably going to take the car company to court for the ambulance bill, which can be pretty steep