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I am sorry but you cannot. You need the permission of the Department of Transport to start laying obstructions of this nature.
Usually speed bumps are fitted following a certain number of casualities which will be the issue here. Also, the counter argument is that they slow down emergency vehicles as well as conventional traffic.
You can always complain about the decision of the council but it is not possible to change the nature of the road surface without proper authorisation.
Sorry if that is bad news.
Can I clarify anything for you?