I've been driving through rural Serbia for the past day on two lane highways with no sidewalks & not much of a shoulder. There are ton's of people walking along the edges of these streets, traveling from one town to the next. I even offered of a couple of them a ride, and they were happy to keep walking. Another man reading a newspaper was leaning up against a guardrail on the side of the road, again no sidewalk, on a two lane road with a speed limit of 80 kph. And I came across many tractors driving slowly, and a big cart of wood being being driven buy 2 peopled & pulled by oxen. I also drove by 2 kids walking side by side holding hands, walking along the edge of the road in the same lane I'm driving.

These roads are not just for fast driving cars.