They are located on internal European Union borders, since Austria, Italy, and Slovenia are members of the EU and the free travel Schengen Area with a common visa policy.
它们位于欧盟内部边界，奥地利、意大利和斯洛文尼亚都是欧盟成员国，也是自由旅行申根区，有共同的联盟签证政策。