I have a very vague recollection of reading that CMFB would only have two types of hedgerow, "Hedge" and "Low Bocage", and that for movement purposes they would be treated the same, unlike in Battle for Normandy. Obviously, now that I want to find it in the manual I can't.
So I just ran a quick test with a Locust and a Jeep. Both made short work of the low bocage....