The Schengen Agreement providing for passport-free transit is what makes freedom of movement for people meaningful. But, given the inability of participating states to control their borders with non-EU countries, Germany and other Schengen members have temporarily reinstated controls.
申根协定规定人可以免签证流动，让人的迁徙自由变得有意义。但是，由于参与国无法控制它们与非欧盟国家的边境线，德国和其他申根成员国临时恢复了边境控制。事实上，这一动作可能并非临时，如今，要求取消申根协定的声音颇有影响力。