EEA Report No 14/2016 (Quiet areas in Europe) states on p. 25 that "12 replies out of 26 stated that, in their country, one could encounter actions related to the protection of quiet areas in open country". I know that such efforts are underway in Sweden, while the Swedish Road Administration in charge of such efforts are unaware of any other EU member states doing anything corresponding. Which are the other 11 states where such efforts are underway?
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