[OSM-newbies] Splitting streets into one ways--too much?

[Paul Johnson]

On 12/09/2010 10:21 AM, Pieren wrote:
> On Thu, Dec 9, 2010 at 6:38 AM, Paul Johnson <baloo at ursamundi.org
> <mailto:baloo at ursamundi.org>> wrote:
> 
>     In the US, a center lane bordered by double-yellow lines on both sides
>     is the same as a median and can't be legally crossed
> 
> 
>  
> 
>     If it's an open median (ie, double-solid yellow lines on both sides),
>     then I'd mark it as two separate roadways, since that's what it
>     functionally is; otherwise, one roadway.
> 
> 
> Until now, the "rule" in OSM was to say "we separate only if it
> physically impossible to turn", not legally.

It's physically possible to turn across most, if not all, medians,
though.  It just depends on your vehicle's ground clearance (it's quite
hard to stop a bicycle!) and proclivity for jumping over curbs or grassy
or gravel medians.

> If you have a barrier, land grass, etc... separate.
> If it is just a yellow or white single or double painted line or a
> traffic sign, then you draw lanes in OSM, not roadways as defined by the
> tag "highway". I'm not against drawing lanes but then use another
> tagging schema.

I'm curious what the general consensus is on this, since it would be a
lot more useful, especially for routing engines, for what the functional
area is, given that it's generally illegal to cross a median, whether
paved or not.  Moreso given that if you're more interested in what land
is within the right of way, you have the landuse=highway tag for
polygons, freeing up the waylines for what is functionally possible with
the way.

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