Paul Johnson <ba...@ursamundi.org> wrote:

> Sharrow markings are typically (and properly) only found on bicycle
> routes
> that do not have dedicated bicycle lanes, and bicycle boulevards.
>  cycleway=shared_lane in the US, save for locales that Did Not Get the
> Memo™, should also have bicycle=designated and be a member of the
> appropriate type=route, route=bicycle relation.
> 
> 
> On Sat, Jan 12, 2013 at 9:05 AM, Greg Troxel <g...@ir.bbn.com> wrote:
> 
> >
> > Balgofil <balgo...@gmx.net> writes:
> >
> > > 1. "Radfahrstreifen": cycle lanes which are mandatory indicated by
> a
> > > sign and a solid lane (cycleway=lane)
> > >
> > >  2. "Schutzstreifen" cycle lanes with dashed lines not so wide as
> a
> > >  "Radfahrstreifen" and therefore only advisory and no sign
> (cycleway=?)
> >
> > I think the most important thing is to define the semantics of what
> is
> > required.  One problem (feature?) of OSM tagging is that there are a
> lot
> > of implicit defaults, and these make it hard to use the data.  I
> think
> > we should be gradually defining the implicit tags (in the main tag
> wiki
> > page, not in the database).  By that I mean things like
> highway=footway
> > implies motorcar=no.
> >
> > It sounds like Radfahrstreifen means that a cyclist may not ride on
> the
> > road outside the lane.  But with Schutzstreifen, a cyclist may ride
> on
> > the road to the left of the dashed line.  Or by mandatory do you
> mean
> > that cars are prohibited from crossing the solid (white?) line into
> > Radfahrstreifen but not prohibited from crossing the dashed line
> into a
> > Schutzstreifen?
> >
> > In the US, cycle lanes on roads seem to usually have solid white
> lines,
> > with dashed lines for turning places.  I am unclear on whether there
> are
> > restrictions on cyclists in various states (in MA, I don't believe
> so,
> > beyond the standard rule that cyclists must ride as far to the right
> as
> > can be done safely, which is usually less far than cars think :-). 
> But
> > I think cars are prohibited from driving in cycle lanes - I did see
> a
> > Big Brother sign exhorting cars to stay out.
> >
> > In the US, my impression is that sharrows are just a reminder to
> > everyone of the normal rules which always apply and have no real
> > significance.  In that respect, they are kind of like signs that say
> > "Please drive nicely", or "Check twice; motorcyles are everywhere.".
> >
> >
> > _______________________________________________
> > Tagging mailing list
> > Tagging@openstreetmap.org
> > http://lists.openstreetmap.org/listinfo/tagging
> >
> >
> 
> 
> ------------------------------------------------------------------------
> 
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The typical pattern here in Nashville, Tennessee, USA is for designated bicycle 
routes to have dedicated bicycle lanes mid-block, and sharrows at 
intersections, rather than have motorized traffic turn across a bicycle lane 
that is outside of the turn lane.

-- 
John F. Eldredge -- j...@jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to 
think at all." -- Hypatia of Alexandria
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