I am trying to fix a routing problem, that I found whilst investigating
an error was reported in mapdust.

It is a strange one and has me totally baffled, so hoping someone here
can help.  

A simple U-Turn around a roundabout, adds a detour along Llangollen
Road, to then use Tower Hill to turn around and come back to the
Roundabout. Dragging the start point around the roundabout does
eventually work once you have passed the first exit.
http://map.project-osrm.org/Uv

Using the same finish point, but moving the start to the A483 exit slip
road has another strange result. There are no obvious turn restrictions,
as they are all possible, with different finish points. 
http://map.project-osrm.org/Uz

I am assuming it is more than a problem with OSRM. Otherwise I guess the
only option is just to re-survey, delete and redraw the area.

Thanks Phil


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