[OSM-newbies] cycle map rendering

[Alex Mauer]

On 09/11/2009 03:44 PM, Akkana Peck wrote:

>> Beyond that there should be only bicycle=designated.  There is also
>> bicycle=official, but perhaps that can be preprocessed into access=no +
>> bicycle=designated before rendering begins?  The meanings are the same...
> 
> I've been following along trying to understand the difference
> between bicycle=designated and bicycle=yes.
> http://wiki.openstreetmap.org/wiki/Tag:access%3Ddesignated
> seems to say that it gives some sort of special status to that
> mode of transport compared to others, which isn't the case on
> multi-use paths here.

One example of that might be a place where the usual case is that
bicyclists must yield the right-of-way to pedestrians, but if the route
is signed then pedestrians must yield the right of way.

This sort of special status is certainly not a prerequisite for using
bicycle=designated, it only means that e.g. “bicycle=designated marks a
designated bicycle route, whatever that means for this jurisdiction.” ­–
as the page says, “It *may* imply extra usage rights or may be just a
suggested route”  It sounds like for you it’s the latter.

Perhaps the wiki page should be reworded to be more clear.  I thought
“may” was enough to avoid confusion.

> But if you think that bicycle=yes paths shouldn't be shown on a
> cycle map but bicycle=designated should, then there must be some
> important difference I'm not getting from that wiki page; it's
> clear to me that our cycle trails ought to show up on a cycle map.

bicycle=yes just means that bicycles can go there.  It would not be
incorrect to tag all roads except interstates with a bicycle=yes, at
least in my jurisdiction.  So tagging bicycle=yes by itself doesn’t give
anything beyond what no tagging at all would.

> Could you possibly explain this a little, so I know how to mark
> trails in future (and whether I should go back and change the
> ones I've already entered)?  Should I (and anyone else who's been
> using bicycle=yes) be changing all our highway=path bicycle=yes
> mountain bike trails to bicycle=designated instead?

If they’re intended for mountain biking, it’s probably correct to mark
them as bicycle=designated.  So I’d suggest doing just that.  Naturally
I’m not an absolute authority on this, and tagging bicycle=designated
won’t have any effect on the cycle map until the people who admin that
map decide to do so.  Neither will bicycle=yes.  Unfortunately you’ll
need to use highway=cycleway in order to get it to appear on the Open
Cycle Map.  (this is correct tagging; it just doesn’t work well with
shared-use trails)  On the plus side, highway=path with
bicycle=designated or foot=designated (or both) /are/ rendered on the
standard mapnik layer.

Hope this helps
-Alex Mauer “hawke”

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