[as modifier] denoting an agreement on border controls signed in 1985 by France, Belgium, the Netherlands, (West) Germany, and Luxembourg, and later by a number of other countries
An agreement between 24 countries in Europe, allowing people to cross the borders without a passport and checking their ID card. Thus the old buildings on the borders are no longer in use, therefore on the borders of lots of old members of the agreement you can't see anything else, but a common EU-state sign welcoming the visitor
(Hukuk) Schengen "acquis" Schengen Sözleşmesi Benelux Ekonomik Birliği, Federal Almanya Cumhuriyeti ve Fransa Cumhuriyeti arasında sınır kontrollerinin tedricen kaldırılması hakkındaki 14
(Hukuk) Schengen Convention (Convention implementing the Schengen Agreement of 14 June 1985 between the Governments of the States of the Benelux Economic Union, the Federal Republic of Germany and the French Republic on the gradual abolition of checks at their common borders)