Why the downvote? With the exception of the Eurotunnel route, customs checks remain unaffected by juxtaposed immigration controls and continue to take place up

Why the downvote? With the exception of the Eurotunnel route, customs checks remain unaffected by juxtaposed immigration controls and continue to take place upon arrival after disembarkation. https://en.wikipedia.org/wiki/Juxtaposed_controls https://en.wikipedia.org/wiki/Juxtaposed_controls