Warning! Bees! Putting up a Bee Warning Sign

I got stung 5+ times on a previous run (not shown) so we came back the next day to put up a sign to warn other runners and bikers on one of our standard trail running routes. I think the bees were yellow jackets, but I a not sure - I never got a good look at them. Instead, I just kept running. Don't worry, we kept the border collie away until I made sure we were not going to get attached by bees again. Also, we went back several months later (in the winter) and removed the signs to make sure there was no damage to the trees.