Streetcomplete: Lanes for streets

[RubenKelevra]

General

We in Germany got many country roads which doesn't have center divider line and are very narrow. This would be a very useful information for routers, because you cannot drive that fast on those roads.

So it would be interesting of a unclassified road has 2 lanes, 1.5 or just 1 lane, where you need to find a wide place to pass other vehicles.

In cities this is a very bad idea to implement this, cause the lane numbers often change, which would make way splits necessary, but in rural environments this would be possible.

Checklist

Checklist for quest suggestions (see guidelines):

• [x] 🚧 To be added tag is established and has a useful purpose
• [x] 🤔 Any answer the user can give must have an equivalent tagging (Quest should not reappear to other users when solved by one)
• [x] 🐿️ Easily answerable by everyone from the outside but a survey is necessary
• [x] 💤 Not an overwhelming percentage of elements have the same answer (No spam)
• [x] 🕓 Applies to a reasonable number of elements (Worth the effort)

Ideas for implementation

Element selection:

If there's no lane tag for a highway=unclassified|tertiary|track(+grade1)|service" and it's not inside a city (maybe determine by the speed restrictions) than ask for the lane numbers: 1, 1.5, 2.

Proposed GUI:

If 3 or more as answer should be possible we need to display the street like for bike lanes, to make it possible to select a direction per lane count.

I don't feel this is necessary, most lane counts should be below 3.

[ENT8R]

If you want to propose a new quest, please use the issue template to fill out answers which makes it easier to implement the quest...

[ENT8R]

BTW: In https://github.com/westnordost/StreetComplete/issues/38#issuecomment-289601303 said @westnordost that "a lane quest is on his list"

[RubenKelevra]

Yea I read this but there's currently no issue open for this, so I opend one. :)

[RubenKelevra]

Updated the issue with the template, thanks for the hint. :)

[rugk]

@RubenKelevra I assume you accidentally closed this issue.

[ENT8R]

@rugk I think you should have a look at this statement: https://github.com/westnordost/StreetComplete/pull/1081#issuecomment-392332668

[rugk]

Yeah, saw it later, so in whatever way that turns out, @westnordost, please reopen this. :smile:

[matkoniecz]

2 lanes, 1.5 or just 1 lane

1.5? How road with 1.5 lane looks like? I see some minimal usage ( https://taginfo.openstreetmap.org/tags/?key=lanes&value=1.5 ) and

Some people prefer to tag narrow two-way roads with lanes=1.5.

on wiki, but I am not really convinced that it is a valid tagging. On the other hand I am not sure what lane tag road without explicit lane markings wide enough to make passing of vehicles usually possible but narrow to require passing places for busses/trucks.

lanes=2? After all, there are full sized roads with explicit lane markings where busses have big trouble to pass.

[RubenKelevra]

@matkoniecz maybe there's a better tag for this, than lane=1.5, but it's definitely not lane=2 in this case.

Here's an example

[westnordost]

https://wiki.openstreetmap.org/wiki/Key:lanes#No_lane_markings

[RubenKelevra]

https://wiki.openstreetmap.org/wiki/Key:lanes#No_lane_markings

Yeah, this article changed significantly since I've opened this ticket. See the old version

This idea boils now down to a quest:

if highway=unclassified && ( ! lanes=* || lanes=1.5 || lanes=none || lanes=no || (lanes=1 && ! oneway=yes) || lanes=0 ):
    ask for lane_markings
if lane_markings=no:
    ask for width & remove lanes-tag
elif lane_markings=yes:
    ask for no of lanes

I think that quest is pretty important since we will collect details that are crucial for semi truck and large trailer routing.

We could expand this to inside the city as well, to get small streets with no lane markings in the middle separated from wider streets which has a center lane marking and thus better traffic flow.

[matkoniecz]

I found a very interesting use case - https://github.com/dabreegster/abstreet (it is a traffic simulator/game) that generates city maps from OSM data. Seattle is prominently supported, but making maps by importing from .osm file is also possible.

I am mentioning it, as it is the first data consumer known to me actually using this kind of data - and it is generally accessible.

[arne182]

I am also using this for https://github.com/arne182/ArnePilot autonomous driving to figure out which way is the most likely path that would be driven on. On the idea of 1.5 lanes, how I understand it is the amount of center lines is a clear indication of 1 or 2 and if one then rather width with source:width=estimated

[kmpoppe]

While I was trying to build a quest for this I noticed that there must have been a "streetLanes" quest at some point? Is it gone? Did it never get finished @westnordost?

[westnordost]

There isn't a street lanes quest yet.

[westnordost]

And it will be more work, because I need to think of a good UI for this too. I think this quest is not eligible for new contributors. But I will implement it, soon.

[RubenKelevra]

@westnordost please reopen this ticket, since we still don't collect the lane count or width for roads with unmarked lanes