Denmark has entered the Schengen cooperation and the border posts between Denmark and Germany have been closed.

Under Schengen, border control of people travelling between two Schengen countries is abolished. This means that a person travelling from one Schengen country to another will not go through passport control. This in turn means that measures will be tightened on the outer borders - i.e. borders to the countries that do not form part of the Schengen Agreement.
Travellers in other Schengen countries must carry a passport or other valid travel ID. However, Danish citizens can still travel in the Nordic countries without carrying a passport.

All passengers travelling into and out of the Schengen area must still show their passport.

The Schengen cooperation also entails a closer cooperation between the Schengen countries' police forces to prevent and combat cross-border crime. Hence German and Swedish police will in very specific cases have the authority to carry out certain tasks in Denmark.

Schengen rules set out a number of conditions that foreigners must comply with to enter another Schengen country, e.g. the foreigners may not be listed as unwanted in the Schengen Information System (SIS) which is a shared EDP system for exchanging data.

Finally, the Schengen cooperation makes it easier for foreigners possessing a visa or residence permit to travel between the Schengen countries.