Improve current way name label

[bsudekum]

This should be US-101 instead. If a way name includes a ref, we should use this instead.

/cc @1ec5

[1ec5]

It should include both the shield and the name, since we don't have the data to know which is more relevant. (Think county and state route numbers on surface streets.)

[1ec5]

We do know the current road’s classification (especially after #297). In general, we can assume that the shield is more important for freeways. However, I still think we should show both if possible, just in case.

[ericrwolfe]

~This should be improved with the changes in #291.~

[1ec5]

Is this issue about the label at the bottom of the map (the “current way name label”) or the upcoming way name label in the turn banner? The former has not been improved since its original implementation.

[ericrwolfe]

@1ec5 oh yes, you are correct. The current way name label is indeed the small label at the bottom of the map.

The logic used for fixing #291 could also be used to determine the proper current way name label.

[ericrwolfe]

we can assume that the shield is more important for freeways

A shield is probably too small for the way name label here, especially since shields already appear in the map along the route line, so using the textual US-101 would be fine to start.

[1ec5]

using the textual US-101 would be fine to start

The street name currently comes from Mapbox Streets vector tiles because of how OSRM collapses name change instructions. U.S. Route 101 would be represented in the vector tiles as shield: us-highway ref: 101. We’ll need to map each of these shield values to a recognizable prefix.

[bsudekum]

Closing in favor of https://github.com/mapbox/mapbox-navigation-ios/issues/590