[OSM-talk] two highways use the same way

[Rory McCann]

Louis Liu wrote:
> Hi:
> 
> How do I tag highway section that shared by two or more highways?
> 
> This is an example:
> http://p2.p.pixnet.net/albums/userpics/2/2/32022/1207242904.jpg
> The road sign presents the way section is highway 19A (省道臺十九甲線) and
> also highway 172 (172 縣道).
> The situation is common in Taiwan.
> 
> In cording http://wiki.openstreetmap.org/index.php/Tw:Taiwan_road_tagging,
> highway 19A is tagged as "highway=primary"
> and highway 172 is tagged as "highway="secondary".
> 
> So, how can we tag it?
> 
> The relation between the two highway:
> 
> 
>               |
>               |19A
>               |
> --------------========================------------------
>   172                  19A & 172      |             172
>                                       |
>                                       |19A
>                                       |

Hi Louis,

I believe the proper way to tag this is by using the semi-colon to 
seperate the possible values. Eg 'ref=19A;172'. I think you should tag 
it 'highway=primary' and not 'highway=primary;secondary'.

At least in Ireland, there are a few national routes that have a 
motorway section (eg N4 is the main road and part of it is a motorway, 
the M4). The motorway section would be 'highway=motorway'

Ref:
http://wiki.openstreetmap.org/index.php/Faq#What_shall_I_do_for_roads_that_have_multiple_values_for_a_tag.3F

Rory