Hello! How high does a fence have to be to discouraged chickens from escaping? Is 4 feet enough? I let my ladies free range but they've gotten into the bad habit of walking out the driveway and across the road. Yesterday one of my girls got hit by a truck. Thankfully she only seems to only have a broken wing. So I'm looking to build a fence to corral them into the back yard where they are safe. Anyone have any suggestions or advice?