What is the Neum Corridor? It's a part of Bosnia-Herzegovina territory around Neum where separated parts of Croatia are connected. On both ends of the road 9.2 kms long are border crossings for international traffic, opened in April 2013.
Who can pass through the corridor? This road can be used by all travelers, both Croatian (EU) and foreign citizens, according to EU custom rules. All the passengers with freedom of movement according to EU legislature (meaning citizens of EU, Switzerland, Liechtenstein, Iceland and Norway) who are travelling to Dubrovnik or from Dubrovnik can pass both borders with personal ID or passport, and carrying goods for personal use. Third countries citizens will pass border control by the EU legislature, meaning they will get a stamp in the passport each time they cross Croatian border. Same is for those who need visas for Croatia. Those with single-entry visa once when they cross the border and continue to Dubrovnik, won't be able to go back the same way, so they need a multiple-entry visa. Considering visas for Bosnia, only Kosovo citizens need B-H visa, and refugees. Even they don't need visa if have Schengen visa.