[Tagging] New proposal: Obligatory tagging of oneway on motorway_link

[Paul Norman]

On 9/10/2015 5:20 AM, Joachim wrote:
> Define on the wiki page of highway=motorway_link that oneway=* must
> also be tagged for every motorway_link. If not tagged, the oneway=*
> status of this way is undefined.

Explicitly tagging oneway on links is preferable for obvious reasons, 
but you need to be careful with must, which is wrong for two reasons.

- The wiki can document, but not set out requirements, as people can 
ignore the current state of the wiki.
- Your next sentence discusses the lack of oneway
- There is not a concept of formal validity, so must doesn't apply
- Data consumers will make their own decisions

> Tools to help enforcing the obligatory usage:
> [...]
> - No routing over undefined oneways
The chances of anyone implementing this in their routing engine are 
approximately zero.