@cainmark asks:

Q5. What do you do if a route you planned is suddenly closed for repairs and no detour is marked?

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@ascentale @cainmark @bikenite
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A5
I've only had this happen once, in South Wales.
A road closed sign, but apparently still pedestrian access.
It would have been a several km detour mostly uphill, so I slowly carried on until I could talk to someone. He let me through with a warning to get out of the way of any lorries as they wouldn't be expecting any traffic.