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Hard to attribute to route planning fail. The maps show it's there, there are no street view of any of the roads in the area (so you can't just say "this one doesn't have SV so that must be the bad one") and it's one of so many roads that you'd only be on for a short period that I don't imagine Googling every road number is feasible and even Open Street Map shows it in detail and reports consistent quality.
I bet we'll see a lot of people going down that road, I just hope they figure out not to continue.
Velocio-
Yes and no.
What does strava heatmaps say?
What should one infer from a lack of google images being posted of that road (most images are posted by people in cars)?It's clearly an error. Without looking in detail I can't say how easy it would have been to avoid it. In 2016 I considered taking a shortcut in Bosnia. I had to spend a bit of time researching it but from the available data I was able to work out that it was mostly unpaved and that few people rode it, so I decided against it.
Bjorn has done three or four things now that suggest to me that he has been a bit careless with his route this year and this fits the pattern.
frank9755
Looks like he had to backtrack and is heading over to the road that Skinny took. Disastrous route-planning fail! And there are half a dozen other guys following behind him!