I drove a rental car for seven days in Bulgaria and in those seven days I saw a lot of different road conditions. Some of the highways were well paved and well marked; others were a collection of patches, dips, and potholes big enough to destroy a small car. I also saw the recklessness of Bulgarian drivers; passing on a curve or when there is oncoming traffic, riding the center dividing line, and rarely using a turn signal. I took strides not to drive at night and to avoid driving around in cities when I could help it. Renting a car was a great option for us. For around $100USD plus gasoline, we were able to explore the country and access trail heads that we would not have easy access to without a car. I would advise to proceed with caution at all times. You never know what lies ahead of you on the roads of Bulgaria.