I managed to do enough Lua coding today to make my first attempt at a stylesheet for the flex backend of osm2pgsql to create the tables that the renderer for pictorial highway shields in OpenStreetMap will need.
The code is still pretty nasty - I'll clean it up on Monday - but it's producing the tables. I tried it on an export for Connecticut (rather than attempting the whole map), and it's turning out tiles that look just as they did before.

True to form, I found a bug in osm2pgsql while I was working on this. Nothing I can't work around. (2020-11-09: The maintainers are amazing. It's fixed already.)
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