Living streets

[dabreegster]

cargo run way 1005922755 yields "error": "unimplemented: highway=living_street" (https://www.openstreetmap.org/way/1005922755)

Few thoughts:

1) With all the indirections around error transformations, it's not easy to spot the place in the source that's actually deciding this tag isn't implemented. I searched for unimplemented_tag, and the 3 places don't seem relevant. Should we consider one of the error handling crates that adds a bit of context of file + line number of the "thrown" error?

2) I'd add a test case, except I don't know what we want to infer about highway=living_street (the access=destination doesn't seem relevant). Standard 1 travel lane and sidewalk each side?

[BudgieInWA]

A default living street sounds like 1 wide traffic lane in each direction, designated foot and vehicle, speed limit "walking speed" depending on locale.

[droogmic]

Should we consider one of the error handling crates that adds a bit of context of file + line number of the "thrown" error

I looked into that last week, and found that we apparently should use https://docs.rs/thiserror/latest/thiserror/, except it doesn't do the line magic stuff for us, so we need to use https://doc.rust-lang.org/stable/std/panic/struct.Location.html ourselves maybe.

[droogmic]

https://wiki.openstreetmap.org/wiki/Tag:highway%3Dliving_street after reading this and correlating it against my own experiences in various countries, I think the default (no locale) should be: a single lane of travel, no direction, and no designated traffic, max_speed defaults to 20, e.g.

[{
    type: travel
    designated: Any
    max_speed: 20,
}]

This requires reviving https://github.com/a-b-street/osm2lanes/blob/main/rust/osm2lanes/src/road/lane.rs#L79

[BudgieInWA]

This reminds me of the question on the OSM side about tagging "2 lane" roads without lane markings: I don't remember where I read it, but it seems like the a road with no markings that is wide enough for 2 cars to pass each other would be tagged lanes=2 because traffic uses the road as if it has one lane in each direction. So, if vehicles on a living street are expected to keep to their side etc. then I think 2 lanes would be appropriate. Using a single lane has its own benefits too, so I'm not against it.

[droogmic]

@BudgieInWA We cover this in our readme :) https://github.com/a-b-street/osm2lanes#examples-4

[westnordost]

speed limit

Differs per country. It's usually between "walk" (~5 km/h) and 20 km/h. See https://wiki.openstreetmap.org/wiki/Default_speed_limits (Ctrl+F "living street")