Why don' t they just build some overpasses that the animals can use instead of thousands of miles of fence??
I think they already do it on the other side of the pond............beautiful, landscaped and VERY large. I am sure it would take a little while for the wildlife to get used to it but once they figured out it was a safe way to cross the highway you can bet they will use it.
(Atlasman begins to plot how he will go about obtaining permission to place a few stands on these funnels....cough cough.......I mean overpasses

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Seriously though it has to be cheaper then billions to fix cars and bury people.