Improve announcements of unnamed roads

[MoKob]

OSM contains quite a lot of nameless roads. For navigational purposes, we should consider using additional information in the graph to improve turn announcements for these kind of situations.

One example would be

osrm

Currently the instruction for this turn says turn left only. Given that the turn is onto a dirt road from a larger road (in this case a primary), it could be easy to miss.

We could potentially improve the clarity of instructions if we use road types or other characteristics for announcing these turns.

An example would be turn left onto the dirt road.

Other examples could be parking lots (take a left onto the parking lot) or alleys (turn right into the alley).

It's not a pressing issue, but something we could consider.

[daniel-j-h]

Rewriting road properties as destinations?

[emiltin]

this is especially important for bike/foot routing, where a lot of paths often don't have names.

related isuses: #604 #1165 #1342 #1514

for our ibikecph.dk service we encode the highway tag into the streetname and exctract/use it in the front end after translation. you can see an example at https://www.ibikecph.dk/en#!/x506b.7hife/x4ywl.7hnrw, if you fold out the route description you see it tells you to head on 'footway'.

preferably the lua profiles could store tags for ways without names. this could be based on way type, road surface, etc. the front-end should then be able to use them easily. this could in fact be done with #1342.

translation have to happen in the front-end.

[midnightcomm]

Similarly, highways with a ref tag, but no name, are considered to be unnamed. If there is no name, I would like the ref to be given instead.