Good advice Nanci . . . my husband and I were riding with four other friends on some state land that was posted no motorized vehicles. Just bikes, hikers, and horses. Well we ran across three guys on dirt bikes and of course the guys told them they were not allowed on the trails. Some words were exchanged and they rode off. We thought that was the end of it. But then we heard their motors approaching again, and they zoomed by us and intentionally drove through huge mud puddles and sprayed all of us! They spun their wheels and threw gravel our way too. Then sped off laughing. We were lucky we just got mud and gravel. But I always carry a cell phone whether I am on my road bike or somewhere in the woods on my mountain bike (usually there is no signal when I'm mountain biking) and just report it to the sheriff or ranger.