Improve Māngere import

[dabreegster]

Some of the problems...

This is #32 -- the coastline / ocean isn't getting imported.

I recently made progress in a-b-street/osm2streets#62 at merging these into a single intersection, so you can treat it like one logical traffic signal. I can try the fix out here

When cyclepaths are mapped in OSM separate from the road, they often overlap like this and cause issues. I'm working on fixing this in Seattle right now in a-b-street/osm2streets#59 and can try out the fixes here too.

Ask for Jack and Prabhjot: find zone polygons for https://flowmap.blue/. The spreadsheet has trip count broken down by mode from zone1 -> zone2. But each zone is just defined as a single point, the centroid. Is there another data source with the full polygons? We need that to know which buildings belong to each zone.

[dabreegster]

https://www.openstreetmap.org/way/947930357
oneway=yes but with lanes:backward is probably not correct, and it's causing this part of the road to be too thick and overlap the other side

[dabreegster]

Lots of the groups of traffic signals are now consolidated.

[dabreegster]

Kirkbridge and SH20 were a mess; the one-way segments had lanes tagged both forwards and backwards. Fixed up in https://www.openstreetmap.org/changeset/108949388 and similar. Still need to snap the cyclepaths, but I'm still working on making that work reasonably around Seattle. Will revisit. But this Sunday's build will have the above fixes.

[dabreegster]

No active collaboration here