No, its because people sometimes try to cross the freeway. Think of it like the Deer signs.
But WHY are people trying to cross the freeway in the middle of nowhere in the Camp Pendleton area? And why would a woman with 3 small children?
Perhaps when they try to avoid immigration services. I don’t know. As for the woman and kids, it’s likely targeted to draw more attention than a man and woman would.
A car/truck is pulled over. Out pour the illegals. Some may bolt into traffic to avoid capture.