Distances are based on Routenet.nl or ANWB Routeplanner, the shortest routes.

Distance BOC 7 is based on route Utrecht- Frankfurt - Nurnberg - Regensburg - Graz - Maribor - Zagreb - Belgrado

Distance BOC 6 is based on route Utrecht- Frankfurt - Nurnberg - Regensburg - Graz - Maribor - Zagreb - Banja Luka - Sarajevo