Thirty years next to a road that keeps getting busier! I have a good fence but every now and then a chicken will figure that it's fun to play in the ditch. Often it will be a leghorn, they seem to be the most prone to escape. I have never had one go out on the road. Usually they run back in when they see me. The flock seems to have a route they travel most days as they roam but they do walk almost the whole fenceline every morning, then a group siesta, then they all have different things they want to do - this is when a fence jumper will go out. Honestly, it's never been a problem for me (except when well-meaning people decide to try to herd them back in or sit in my driveway, honking for me to come get it).