Phillips Army Airfield used to have a stop sign off the end of the runway for crossing traffic as well as a horn that I guess was supposed to sound to warn you to stop. I never heard it being used. PAAF wasn't that busy of a place and half the time there wasn't anybody in the tower so if it was manually activated, there wasn't anybody to do it. I was in the aeroclub, but I also had to drive around the airport to get to one of our facilities back there so I went by a lot.