Hi,
On 03/10/2020 14:05, Brian Prangle wrote:
There seems to be a predilection for adding turn restrictions , either
no right rurns or no U turns at the exit flares of roundabouts to
prevent turning back into the entry flares where there are no explicit
signed restrictions. I suspect this is "rendering for routers". Do
routers actually need this data? I'm tempted just to delete them all
wherever I meet them, but I suspect there are thousands of them and
there'll be howls of complaint.
About the only change I've made in years of mapping 'non-mini'
roundabouts is to split the oneway=yes flare 'V' into two segments. JOSM
validation started flagging the junction node of the V as too tight a
bend, which I suppose makes sense.
I wonder if seeing a junction node of three vertices rather than a
300degree turn on one segment make a difference to roundabout unaware
routers?
Poor attempt at an ASCII diagram explaining what a two segment flare is
below!
Flare 1 ->---\
* --------Road 3 continues away from roundabout
Flare 2 -<---/
Flares are the oneway=yes roads connecting to the roundabout.
These are often a single V shaped segment, rather than two plus the road.
James
--
James Derrick
li...@jamesderrick.org, Cramlington, England
I wouldn't be a volunteer if you paid me...
https://www.openstreetmap.org/user/James%20Derrick
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