To drive from Dubrovnik to Medugorje do I take the highway to Mostar and watch out for the signs to Medugorje?
From Dubrovnik drive towards Split, cross Bosnia and Hercegovina border at Neum, re-enter Croatia and drive to Metković. You will need to cross the border to Bosnia and Hercegovina again, continue towards Čapljina, after Čapljina drive 6 km (towards Ljubuški), there will be signs for Međugorje.
There will also be signs before that along the way, the road is pretty simple to follow so there shouldn't be any problems driving to Međugorje.
Drive safe and happy traveling about 6 years ago