In November 2015, Sweden and Norway introduced temporary border controls, and requirements for all international airlines and ferries to check identity documents, due to the European migrant crisis. From 4 January 2016, Sweden required bus and train carriers to perform identity checks on the Danish side of the Denmark–Sweden border, while still retaining the border controls on the Swedish side. These controls were heavily criticised for violating the rules laid out in title III of the Schengen acquis prohibiting such carrier responsibility within the Schengen area, and were subsequently abolished by the Swedish government on 4 May 2017 to avoid potential formal sanctions. At the border, a traveller will need to be able to present a passport (and appropriate Schengen visa if required), an &lt;a href="National%20identity%20cards%20in%20the%20European%20Economic%20Area"&gt;EU/EEA national ID card&lt;/a&gt;, or a Nordic driver's licence. However, identity cards recognised in the Nordic countries, like ID cards issued by banks or by the Swedish Tax Agency are not accepted.