Even then it's difficult. Presumably multiple cars drove E81 and probably everyone looked at it on a map, but it took a cyclist on the ground to determine it's suitability, so determining a "safe" set route is a big ask unless you use one that has been established for years.
Even then it's difficult. Presumably multiple cars drove E81 and probably everyone looked at it on a map, but it took a cyclist on the ground to determine it's suitability, so determining a "safe" set route is a big ask unless you use one that has been established for years.