[Talk-TW] Taiwan Highway Shields rendering

[Arne Goetje]

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Replying to myself:

On 04/12/2013 02:06 PM, Arne Goetje wrote:
> c. 'ref' where multiple highways merge According to the OSM wiki,
> we should separate tag values with ';', like '1;4;110', where the
> three highways 1,4 and 110 share the same road. However, the ';'
> separator will not be parsed by the rendering engine, that means,
> the value '1;4;110' will appear exactly like this on the map. This
> *does not* work with the highway shields. Since we cannot parse
> this value in Mapnik, we need to put additional information into
> the database.
> 
> I propose the following new tags: 1. add a 'merged_highways' tag
> with a value of 1, 2, 3, or how many highways are merged on this
> way.

I think it would be even better to use 'ref:multi' instead of
'merged_highways'. The ':multi' extension could be used with any tag.

> 2. add tags for each 'ref', like 'ref1', 'ref2', 'ref3', etc. with 
> the correct values.
> 
> Example: 'highway'='primary' 'name'='三民路二段 (Sec. 2, Sanmin Rd.)' 
> 'ref'='1;4;110' 'ref:en'='Provincial Highways 1, 4 & Route 110' 
> 'ref:zh'='台1、4線、110' (or whatever better way to describe it) 
> 'merged_highways'='3'
replace with: 'ref:multi'='3'
> 'ref1'='1' 'ref2'='4' 'ref3'='110' (Note: additional tags have been
> omitted in this example)

Cheers
Arne
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