Guys, he is asking about one lane roads (one lane for same flowing and one for opposite flowing traffic), I think he marked the picture wrong.
But anyway, I have never really paid any attention to that. But in the one video I posted in the topic "dem tight roads", you do see the solid white outer line on the edge of the road (although in some areas is worn out), but in one particular part of the video, Allie comes up on a left turn and there is a church and bit of a parking area to the right and in front of her, this solid white outer line curves to the left alongside with the orange divider line away from the church's parking lot.
Here is a link to the beginning of that part of the video (be sure to have it on 720p or higher otherwise you may not clearly see it, and yes its another Allie video

, now if only YouTube would respond!

):
https://www.youtube.com/watch?v=S-NZGKH ... be&t=5m44s
So that was a tight road possibly nearby a city... now here is a road in Kansas way out in the country:
https://youtu.be/SvPvEyb7IVs?t=7m9s
There is a newly paved road that did not have the solid white outer line but they probably just haven't painted the lines yet.
Now that I have thought about it, it seems to be more to show where the road really is so any other traffic that is not really on the road or coming to a complete emergency stop will have to stay on the right side of the solid white outer line so they won't block a bit of the road impeding traffic and risk getting their front end chopped off or getting a smashing rear end surprise.
And for traffic that is on the road to stay on the left of that solid white outer line so there can be a place to stop by the side of the road for vehicles that need to stop but don't want to stop in dirt and possibly get trapped.
Some of US one lane roads are quite wide, but some of the road is used for a place to stop if needed..... or for extremely wide vehicles.
Although I was expecting for there not to be any outer lines on one lane roads way out in the country.
erm..... might just be better to pay attention to Google maps.
As truckers say "Keep it in between the white lines"
Now here is one in Canyonland (might be Utah):
https://youtu.be/4MhNlcQ4ue0?t=1m46s
I was hoping to find a video where she was in some desert lands.
Perhaps the image without the markings in the OP is in case the solid white outer line is not there or worn out... or crumbled away with the road.
Well, I hope that helps, let us know if you need to know anything else and we will try to help.

...... to the best of our knowledge.
