[Talk-GB] barrier=kerb on highways may be blocking OSRM (Car) routing

[Ken Kilfedder]

Is it worth adding this to Osmose and the other QA tools?

---
https://hdyc.neis-one.org/?spiregrain
spiregrain_osm at ksglp.org.uk


On Wed, 18 Dec 2019, at 4:31 PM, Edward Catmur via Talk-GB wrote:
> Further to this - if you want to look for barrier=kerb + highway=crossing nodes in your area, which may be disrupting routing, the Overpass query is node["barrier"="kerb"]["highway"="crossing"] : https://overpass-turbo.eu/s/P5Y
> 
> On Wed, Dec 18, 2019 at 4:20 PM Edward Catmur <ecatmur at googlemail.com> wrote:
>> Returning to the original issue, I think I've worked out what the problem is. It's that on a crossing node, kerb=* is fine (it describes the presence/attributes of the kerb on the subsidiary highway) but barrier=kerb should *not* be used. 
>> 
>> Combining kerb=* with highway=crossing is blessed by Wiki:
>> 
>>>  If the kerb is identical on both sides of a crossing, it is possible to add the kerb=* tag to the highway <https://wiki.openstreetmap.org/wiki/Key:highway>=crossing <https://wiki.openstreetmap.org/wiki/Tag:highway%3Dcrossing> node, which sacrifices accuracy for simplicity, consider using kerb:left and kerb:right if the kerbs differ. 
>> 
>> but this doesn't say that barrier=kerb should be included on the crossing node! 
>> 
>> I think barrier=kerb + highway=crossing should be regarded as a mistake. Taginfo shows ~ 1000 of them (0.47 of barrier=kerb nodes; 0.03% of highway=crossing nodes) which should fixable.
>> 
>> On Wed, Dec 18, 2019 at 3:37 PM Philip Barnes <phil at trigpoint.me.uk> wrote:
>>> On Wednesday, 18 December 2019, David Woolley wrote:
>>>  > On 18/12/2019 13:31, Edward Catmur via Talk-GB wrote:
>>>  > > That said, the same goes for cars - other than the lowest bodied sports 
>>>  > > cars, pretty much all motor vehicles are capable of taking a kerb at low 
>>>  > > speed.
>>>  > 
>>>  > Although raised kerbs are generally there to stop that happening and the 
>>>  > resultant trespass on the footway can be illegal, e.g. in London. As 
>>>  > such routers should not be routing motor vehicles over kerbs.
>>> 
>>>  Its a level of detail that few of us have mapped, but it is perfectly acceptable, and quite common, to route motor vehicles over lowered kerbs to access private property. 
>>> 
>>>  Phil (trigpoint)
>>> 
>>> 
>>> 
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