I've seen it happen in my jurisdiction that sometimes knee-jerk government decisions actually have proposals that affect municipalities and are in the best interest of not only the local municipality but the corridor itself. I remember getting proposals from some officials to build expressways along the Windsor waterfront to connect the border crossings. The municipality was asked to come up with a plan, and they did in our particular situation.
I don't view this as an interpretation, with great respect, of trumping the act in itself. I believe it provides a window for municipal and provincial laws to be part of the process. I think that's the important aspect.