Your argument implies that "I don't know what is in front of me" can just be used as a signal to "stop the car", but that still isn't OK (slamming on the breaks

Your argument implies that "I don't know what is in front of me" can just be used as a signal to "stop the car", but that still isn't OK (slamming on the breaks on a freeway because a trailer has someone's face on the back of it, for example) Recognition performance matters.