We are on property and our chickens stay off the road. I think it is because we have them in the back of our lot and have various small and inexpensive homemade fences between their area and the road. They could easily get up there, but it is sufficiently difficult that the pickins' are just as good at the easier places to reach and they have what they need out there, places to dust bathe, green plants, water, plenty of bugs, and I always offer food in their feeder inside the coop. They seem to not want to be too far from the coop and being able to see the coop/feeder and they get treats when they return at night. Since our coop is not visible from the road they have never made it up there. But try setting up a flock block or something in the area where you want them to hang out or find other means to attract them to the area you want them in until such time you can make some fences. People on my road don't slow down for a sign that says there will be children so I doubt a chicken sign is going to do enough for you. We also made a large pen for them to be in when the timing for free ranging wasn't good, such as neighbor dog running loose on road. That way we hope they get the best of both worlds, protection and some time to free range as well.
