[OSM-talk] Directional tagging

[Erik Johansson]

On Sat, Nov 29, 2008 at 10:53 AM, Simon Ward <simon at bleah.co.uk> wrote:
> On Fri, Nov 28, 2008 at 02:16:07PM +0100, Martin Norbäck wrote:
>> b) 2+1 ways as we call them in Sweden, they are normal ways but have a
>> small fence in the middle and 2 lanes on one side and 1 lane on the
>> other side. They look like this:
>> http://www.vv.se/filer/Vägprojekt/3-Falt.jpg
>
> Having the fence would suggest you cannot physically traverse from one
> side to the other (without destroying or jumping over the fence or any
> other method you care to think of), which would lead me to representing
> it as two separate ways.  A relation can be used for information about
> the "collective" way.

The = is the right lane and - is the left lane, between them there is
always a fence. A typical road would look something like this:

===============
---====------====---
--------------------------

The point of tagging it is that you want it rendred on the map to get
visual feedback, So with only two ways, you need something line
"lanes=2; render_extended_way=left", which isn't a good way to do it.

/Erik