Extend the "recommended tags" section with tags and info the sign as a node

[tordans]

Context

There are three use cases, we cover two:

1. A way to copy just the traffic_sign=DE:123 tag to use in an editor os text
2. A way to get info on tags that should be applied for a given traffic_sign-tag; copy those tags to use in an editor (or maybe later validation, see milestone)
3. A way to get info on how to map a separately mapped traffic sign node => this is what this issue is about

   Considerations

• Research the recommended way to place those nodes (next to the road, on the road)
• Add this info to the data
• What text like info do we need to educate users?
• How to handle forward/backward?

[1ec5]

Do any of the tagging recommendations apply to things beyond the immediate roadway? On the wiki’s U.S. traffic sign pages, many of the recommendations refer to things many miles away, especially amenities mentioned on guide signs. Other signs about intersections can affect multiple roads at the same time. I’d imagine that a tool like this could provide informational text about those tangential features, similar to what the wiki does today.