Balkans overtaking

As we neared the Bulgarian border the terrain become much more mountainous and the roads narrowed. On many occasions we found ourselves behind slower vehicles. This didn't stop the driver making a few hair raising leaps out of the queue of cars. These particular three were quite stubborn though and at one point when our driver misjudged the space and had to pull back, the last car, right in front of us, refused to give way so our driver had to break hard and slammed his fists on the horn. Eventually the three cars turned off in unison (which seemed odd) and our driver again sounded the horn in anger. But we survived.