Series of caches along the E73
Take a rest and take a cache.
https://en.wikipedia.org/wiki/A1_(Bosnia_and_Herzegovina)
The A1 motorway (Bosnian: Autocesta A1, Serbian Cyrillic: Аутопут A1, romanized: Autoput A1) is a motorway in Bosnia and Herzegovina that is part of the European route E73 and, together with Croatian motorways A10 and A5, and the Hungarian M6, will provide a modern and fast road connection from Budapest to Ploče, a seaport on the Adriatic Sea. The motorway will connect the capital Sarajevo with other large cities, such as Mostar and Zenica. It will also be the main link to Bosnia and Herzegovina from the Adriatic Sea and Central Europe.
https://en.wikipedia.org/wiki/European_route_E73
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.