[Talk-GB] Turn Restrictions at roundabouts

[Philip Barnes]

On Sat, 2020-10-03 at 16:50 +0100, Tom Hughes via Talk-GB wrote:
> 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.
> 
> Surely if there is a flare then the entry half of the flare will
> be one-way against anybody turning off which should exclude it from

Tom

They are intended to stop this type of routing
https://www.openstreetmap.org/directions?engine=graphhopper_car&route=52.64994%2C-1.20491%3B52.64983%2C-1.2049

Which is techincally not illegal and in real world usage is not going
to happen.

Phil (trigpoint)
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