European route E73 forms part of the United Nations International E-road network, connecting Hungary and eastern Croatia to Bosnia and Herzegovina and the Adriatic Sea in the vicinity of the port of Ploče. This 679-kilometre (422 mi) route is also designated as the Pan-European Corridor Vc, a branch of the fifth Pan-European corridor. The route largely consists of two-lane roads with at-grade intersections, although in the 2000s, about a third of the route was upgraded to motorway standards. The remainder of the route is currently being upgraded in all the countries spanned. The longest part of this corridor goes through Bosnia and Herzegovina and is widely touted as a road instrumental to the development of the country. The road also serves as the shortest connection of the eastern and southern parts of Croatia.

The Port of Ploče is a seaport in Ploče, Croatia, near the mouth of the Neretva river on the Adriatic Sea coast. It was formally opened in 1945 after a railway was built as a supply route to connect the site with industrial facilities in the Sarajevo and Mostar areas of Bosnia and Herzegovina, which was then part of Yugoslavia. As of 2010, it ranked as the second largest cargo port in Croatia—after the Port of Rijeka—with a cargo throughput of 4.5 million tonnes, consisting mostly of general cargo and bulk cargo, including 20,420 TEU Containers. In 2008, the Port of Ploče recorded 2,555 ship arrivals. It is managed by the Port of Ploče Authority.