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.

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.

[1][2] The E73 route through Croatia starts at Duboševica border crossing, following the D7 state road to Beli Manastir and Osijek.

South of Beli Manastir, there is a junction with the European route E662, signposted as the D212 state road.

[2][3][4] The E73 route in Bosnia and Herzegovina starts at Svilaj border crossing, following the A1 motorway for 9 kilometres (5.6 mi) to Odžak.

In Bradina, the E73 once more switches to the M-17 road which carries it past Konjic, Jablanica, Mostar and Čapljina.

1264, the Declaration on the Construction of Main International Traffic Arteries,[9] signed in Geneva on September 16, 1950, which defined the first E-road network.

This declaration was amended several times before November 15, 1975, when it was replaced by the European Agreement on Main International Traffic Arteries or "AGR", which set up a route numbering system and improved standards for roads in the list.

Reorganization of the E-roads network of 1975 and 1983 redefined the E73 designation previously associated with Cologne–Hamm road and assigned it to Budapest–Osijek–Sarajevo–Metković route.

The first Hungarian motorway section along the M6/E73 route was completed between Érd and Dunaújváros in 2006 after the Pan-European Corridor Vc was given development priority following the Helsinki conference.

[12] As of August 2011, the A5 was scheduled to be extended north across Drava River to Beli Manastir and the Branjin Vrh border crossing to Hungary where it shall connect to the M6.

[5][19][20] In the early 2000s, the A1 motorway received much media attention in Bosnia and Herzegovina as it was to be the first motorway-standard road in the country.