Could happen that the runway is closed. We could come up with all sorts of esoteric reasons for how it might not work quite right. But when you consider the low probability that the system will be used at all and the low probability that the runway it chooses has a paving truck on it, you’re into some really unlikely situations. So, yes, could happen, but not likely. It does not understand anything broadcast at it. But it does broadcast every 30 seconds on the local frequency (changing the frequency as it progresses along its route to the airport; as well as broadcasting on the emergency frequency) its intended landing runway and time to destination, so any airplanes in the area can give way, just as happens when a pilot declares an emergency.