Water Shutters.

[simon]

Could you tell me if water filled 'shutters' would  reduce sound coming through a window? I have a loud traffic noise problem.
What I am thinking of is something like a vinyl rectangular bag an inch or 2 thick that fits snugly into the outside window cavity when filled with water.
While water conducts sound well within it, would it absorb it and then not transmit it through to the other side of the window?
Has this been tried before?
Please let me know