Would an electric gate work for your neighbors and you? I think I saw and electric gate that operates with garage door opener type. Not sure where. I have draft horses that just walk across cattle guards so I was looking into a gate.
Koehn
Drive Thru Electric Gates
This looked good to me.
Looked into electric gates but won't work because my neighbor has a home based business and has lots of deliveries. Also electric gates are very expensive, probably about the same as fencing both sides of the road.