On Wed, Oct 23, 2019 at 09:24:30AM +0000, Philip Barnes wrote: > On Wednesday, 23 October 2019, Jez Nicholson wrote: > > So, for those who like definitions: In the UK, a "mini roundabout" is > > simply a small roundabout that is either flush to the road or slightly > > raised so that large/long vehicles are able drive over it if they need to. > > If it has anything on it, like a lamp post, it is a "roundabout". It is not > > the size, it is the being able to drive over it that matters > > https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/561491/mini-roundabouts-report.pdf > > > There is also the rule that you should not do U turns at mini roundabouts, so > it is important that mapping retains this important distinction. > > These are a very common feature, it does seem odd that routers are not > supporting them.
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.
Flo
--
Florian Lohoff f...@zz.de
UTF-8 Test: The 🐈 ran after a 🐁, but the 🐁 ran away
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