Should that not help wildlife although it may scratch the odd car.
Back home the farmers and indeed any landowner whose land bordered the roads had to by law cut hedges, verges, banks and trees back to specified heights etc. twice a year (usually June/july and September). No subsidies paid you just got on with it, but for the rest of the year they just grew anywhich way.
I was under the impression that lack of hedging was a big problem in rural areas, also loss of native hedging. If I were redoing my garden I would plant a native hedge as I am looking at doing at the front of the house.