Feature request: Mention bridge as attribute of highway

[goldfndr]

Use case
There are many places where a bridge will overlap another highway at a sharp angle or even coincide with the same angle for a great distance. The rendering of bridges uses rounded caps but, from what I can tell, not for transitions within the bridge (e.g. lane count change). It can be difficult to distinguish which piece of road is a bridge and which is at ground level, especially within a downtown area with limited right of way for expansion.

For example, a motorway bridge overlapping a ground-level motorway.

Proposed Solution
In #1326 / b6d286a a tunnel attribute was added for subject roads; improved in #3870. A bridge attribute could similarly be displayed as appropriate.

[Helium314]

tunnel and location=underground show "underground", do you have a suggestion for a similar location label that could apply to bridges (and possibly location=overhead)?

[goldfndr]

I took a look through the quests (including SCEE's) and I'm not spotting one in which location=overhead or location=overground or location=roof might apply that didn't already have level; quest objects seem to be at (or, in the case of barriers like turnstiles and gates, at least attached to) ground level, even the height quests are measured from ground. I didn't spot a pipe/cable color/substance/material quest, and a future power pole attachment quest oughtn't need it (but other power attachments might). Closest I saw was possibly SCEE's color quest for a building:part that lacked level but that seems more likely bad tagging. Is a stile ever fully elevated?

So, for now, I'd say something like:

val bridge = tags["bridge"]
 if (bridge != null && bridge != "no") {
     return resources.getString(R.string.bridge)
}

[westnordost]

As for the label, I think "on bridge" makes sense.