[Talk-GB] Turn Restrictions at roundabouts

[Philip Barnes]

On Sat, 2020-10-03 at 18:36 +0200, Colin Smale wrote:
> On 2020-10-03 18:16, Tom Hughes via Talk-GB wrote:
> > On 03/10/2020 16:57, Philip Barnes wrote:
> > 
> > 
> > > 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.
> > 
> > But unless the start or end point is on the flare why would a
> > router do that over the shorter route on the roundabout... I mean
> > maybe there are a few cases where the flare is shorter somehow?
> >  
> 
> If you take that exit by accident, a fast router may tell you to take
> the sharp turn back to the roundabout. Some flares are longer than
> others, and some routers take longer than others to trigger the "off-
> route" stuff.
>  
> 
But then is it actually illegal?
I am begining to wonder if these are mostly attempts to make QA tool
tight turn warnings go away?
Phil (trigpoint)
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