Juxtaposed controls
Juxtaposed controls (in French: bureaux à contrôles nationaux juxtaposés, or "BCNJ"; in Dutch: kantoren waar de nationale controles van beide landen naast elkaar geschieden) are a reciprocal arrangement between Belgium, France, the Netherlands and the United Kingdom whereby border controls on certain cross-Channel routes take place before boarding the train or ferry, rather than upon arrival after disembarkation. With the exception of the Eurotunnel Shuttle route, customs checks remain unaffected by juxtaposed immigration controls and continue to take place upon arrival after disembarkation.