> The net effect of this, combined with the fact that radar sees through most visual obscuration, is that the car should almost always hit the brakes correctly

> The net effect of this, combined with the fact that radar sees through most visual obscuration, is that the car should almost always hit the brakes correctly even if a UFO were to land on the freeway in zero visibility conditions. Unless he means "UFO" in the formal, aviation sense of an unidentified radar contact, I think Mr. Musk is severely underestimating alien stealth technology. I can't quite wrap my head around the notion that an advanced species could perfect interstellar travel but somehow be incapable of stealth technology.