I was once such a pilgrim to Medjugorje. I don’t know which way these folks went. I took the ferry from Ancona to Split. Then a bus ride along the Dalmatian coast. Beautiful, but in some places it was a shear drop off of the road as you went up into the hills.
The bus was on the A4, one of the major highways leading from the Hungarian border to Zagreb, near the village of Breznica which looks to be about halfway between Zagreb and Varazdin. It was at 5:25 a.m. local time. I don’t know if it would have been light by then—Breznica is about 46 degrees North latitude and it’s toward the eastern end of that time zone so it may get light pretty early.