As used by UFO's

BBC News - RF Safe-Stop shuts down car engines with radio pulse

Well, this is interesting.   There is a subset of UFO cases in which drivers claimed their car was stopped.

I am sure I have read of tests of what it would take to do this in terms of electromagnetisms, and it turned out to be very difficult to reproduce.  But then again, this was many years ago, when cars were far less reliant on electronics than they are now. 

Now, it can be done.   UFO implications are unclear.