[talk-au] Lanes tag

[Paul HAYDON]

Hi John, 

It occurs to me there's at least one other case which warrants tagging the 
lanes - a two-way road (or section thereof) having only a single lane.   I.E. 
when there are LESS than one in each direction, making passing difficult or 
unsafe at normal speeds. 

Any thoughts? 


Cheers, 
Paul. 
--

Message: 3 
Date: Sun, 21 Oct 2012 13:11:07 +1100 
From: John Henderson snow...@gmx.com 
To: talk-au@openstreetmap.org 
Subject: Re: [talk-au] dirt roads 
Message-ID: 508359bb.6040...@gmx.com 
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 21/10/12 12:03, dban...@internode.on.net wrote:

 lanes=[1; 2]

I thing the lanes tag is best not used, unless there's more than two marked 
lanes on a two-way road, or more than one lane on a one-way road.

This is the recommendation in the Australian tagging guidelines: 
http://wiki.openstreetmap.org/wiki/Australian_Roads_Tagging#Number_of_lanes

I have two reasons for arguing this.

Firstly, it's something else that would need checking when doing OSM 
maintenance (and quite unnecessarily). And it's something else to get wrong if 
it's used routinely. It's easier for everybody if its used is reserved for the 
special cases.

Secondly, as an active mapper, I often download the whole of Australia every 
week for use as route-proving on my Garmin GPSs. If every road in Australia had 
a lanes tag, that'd be a lot more data to download... 

John
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Re: [talk-au] Lanes tag

[John Henderson]

On 21/10/12 13:40, Paul HAYDON wrote:


It occurs to me there's at least one other case which warrants
tagging the lanes - a two-way road (or section thereof) having only
a single lane.   I.E. when there are LESS than one in each
direction, making passing difficult or unsafe at normal speeds.

Any thoughts?


I reckon that's quite legitimate if two cars can't pass.  Exceptional
conditions should be flagged as appropriate.

But I wouldn't think a road simply too narrow for two caravans to pass
should automatically get the lanes=1 treatment.  Caravaners are
especially aware of the need to drive to the prevailing conditions, as
are truck drivers.

The width or est_width tags from
http://wiki.openstreetmap.org/wiki/Map_Features are more appropriate in
most such circumstances.

John

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