No, it is a miscasting the problem to suggest we don’t tag trunk roads (which
clearly was not part of the problem). The problem is that there is a tagging
system in place which is ambiguous from an International point of view. So
there should be a clear tagging that is distinct for the meaning of “trunk (UK
sense)” vs “trunk (International sense)”
I am simply suggesting that it would be sensible to resolve the underlying data
so that anyone choosing to use the data is able to understand it readily
without having to assess what country the way has been created in.
So yes, it is an issue for the renderer or the router but I’d ask the question
that if it is a problem for mappers to consider the convenience of the
renderer or the router, then who are you mapping for?
The problem is very simple, for arbitrary reasons in the past the “trunk” has
been used to mean two very different types of highway - in Germany and as far
as I can tell in all other countries a trunk road has default rules that
exclude pedestrians and cyclists by law, in the UK the very same tag is used to
mean simply a preferred chosen national navigation route with no other
implications.
From a database background, is it wise to have such ambiguity in the core data
of a project when there is some way of resolving it?
Perhaps the rest of the world is wrong and should not be using “trunk” but that
is the state of the database we have. I’m not aware of any other attribute of
highway that causes this issue.
Regards
Ian
From: David Woolley
Sent: Friday, 25 July 2014 17:37
To: [email protected]
On 25/07/14 17:15, Philip Barnes wrote:
> Are you proposing we tag for the renderer by not tagging trunk roads as
> trunk?
No. He wants people to tag for the router, not the renderer.
I think that is a bad idea, although not as bad when most trunk roads
weren't already mapped, as it is doing something for the convenience of
a small number or routing software developers rather than a large number
of mappers.
It could be argued that the current approach is actually tagging for the
renderer, except that the details in question don't get rendered in the
standard rendering.
In practice, though, it is more likely that roads would have been
mis-tagged if the most common case required extra permissions to be be
explicitly added.
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