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 <p...@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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> >
>
> --
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