The car is designed to prevent collisions that can be detected by the sensors. This particular collision could not be detected by the sensors, therefore it isn'

The car is designed to prevent collisions that can be detected by the sensors. This particular collision could not be detected by the sensors, therefore it isn't possible for the car to prevent it. Are you basically saying a bulletproof vest has failed to achieve its design goal if it can't stop armour-piercing rounds? Or a fire extinguisher has failed to achieve its design goal if it can't put out a wild forest fire? There are always limitations to everything.