Driving on narrow roads in Guatemala for the past week, including last night for 40 minutes, at night, I have to say that nothing improves the road more and for less money I'm sure, than painting a yellow stripe down the middle, and even more important, painting a white stripe along the edge.
Driving last night was barely any harder than on a 2-lane road in the States.
They didn't have white side stripes when I was growing up. I don't remember when and where I started to see them. Anyone remember???
Until yesterday, I think, I thought the white stripe was an unnecessary frill, but I see how important it is, especially here where shoulders are usually narrow or non-existent.