[Tagging] Deprecating mini_roundabout

[Richard Fairhurst]

Florian Lohoff wrote:
> The point is that a mini roundabout does need a LOT of preprocessing 
> to put it into some graph for your classical A* or Dijkstra. You need 
> to eliminate the node and replace it with a circular road much like 
> a junction.

What? No. No. You don't.

I do precisely no preprocessing for mini-roundabouts in cycle.travel because
they're irrelevant. They're just normal crossroads or T-junctions with no
inherent priority other than traffic already making the turn (similar to a
four-way stop in the US), and some paint in the middle. They are treated
exactly as normal junctions and so they should be.

> You would expect (as you see a roundabout sign) to get instructions to 
> take the n.th exit. 

What? No. No. You wouldn't.

Mini-roundabouts are almost always at junctions with only three or four
exits. The Government guidance explicitly states so
(https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/561491/mini-roundabouts-report.pdf,
para 3.9).

Any UK driver would expect their satnav to say "turn left" or "straight on"
at a mini-roundabout, not "take the first exit".

Could I suggest that you refrain from tag-fiddling on a subject where you
clearly have no experience?

Richard



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