[Tagging] lanes tag dispute

[Nathan Edgars II]

On 9/18/2011 1:38 PM, Anthony wrote:
> On Sun, Sep 18, 2011 at 1:34 PM, Anthony<osm at inbox.org>  wrote:
>> On Sun, Sep 18, 2011 at 1:21 PM, Nathan Edgars II<neroute2 at gmail.com>  wrote:
>>> It's simple on a motorway. But, for a simple example on a surface road, how
>>> do you know where the straight lanes go if there are 3 lanes after an
>>> intersection but 2 before?
>>
>> Depends on what data you have.  If you have lane width information,
>> then it's easy to figure this out.  If you don't, then you can't
>> figure this out.
>
> Nevermind.  Yes you can.  If the center of the 3 lane road is to the
> left of the center of the 2 lane road, then the lane was added on the
> left.  If the center of the 3 lane road is to the right of the center
> of the 2 lane road, then the lane was added on the right.

Ways are not mapped this way. And even if they were, this would only 
work if there's a median.