Hi Florian,

It's more like a designation than a destination, so I think the
destination tag would not be very appropriate for this. An Interstate
has a cardinal direction, and when giving directions you would say for
example 'enter Interstate 80 west'.

On Wed, Nov 27, 2013 at 12:12 AM, Florian Lohoff <f...@zz.de> wrote:
> On Tue, Nov 26, 2013 at 03:46:47PM -0700, Martijn van Exel wrote:
>> So the relation between the east--west and north--south member roles
>> is equivalent to the relation between forward--backward.
>>
>> Because the cardinal direction is commonly included on the road signs
>> (see example 
>> http://www.aaroads.com/west/new_mexico010/bl-010_eb_at_i-010.jpg)
>> this information is useful in the U.S. (and Canadian) context as a
>> drop in replacement for the traditional forward / backward role
>> members.
>
> I still dont get it - Which relation would need this as a role?
>
> If this is a signposted destination i would expect it in the
> destination or destination:lane tag on the road as west e.g.
>
> destination:lanes=West;Los Angeles|East;Boston
>
> For example Mapfactor Navigator will use this to show destinations.
>
> backward/forward as role are in relation to the ways direction. A tag
> can either have a meaning in forward or backward or both directions
> on a way. There is no way a tag has a meaning in 56° left of the way.
>
> Flo
> --
> Florian Lohoff                                                 f...@zz.de
>
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-- 
Martijn van Exel
http://oegeo.wordpress.com/
http://openstreetmap.us/

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