just put 2 4x4 on both sides of the road or path and hinge a 2x4 at the top with a brace underneith it to for a triangle brace that is also hinged, I could draw it but cant get it to post right now, this is a cheap block that you can put a padlock on the end to lock it to the other post or if it is a wide road make a gate on both and a padlock in the middle to hook them together.