Richard Fairhurst

Yes, sorry - it's basically the same as with OSM data.

Clamping to -60° to 75° reduces the shapefile impact from 26GB to 13GB - definitely an improvement but still too much. One other possibility we could consider is shipping an...

That's a good point - we do have an (optional) rtree so I could experiment with using that. It needs a slight adjustment for the `--bbox` parameter to take effect...

> Coastline/landuse can be a pre-processed thematic layer ? On reflection I think this would have huge advantages: not just memory usage, but processing time as well, as all the...

Do you have a list of the categories you're working in? Bear in mind that access implications on footpaths/cycleways are very UK-specific and it is easy to break this data...

Yes, please upload a GeoJSON file or similar somewhere so that the UK community can take a look.

Yes, that's about right; hopefully a bit less time than that. Currently finishing off a set of performance optimisations which will give some harder numbers.

Whenever I've written a tileserver I've had to [patch in some code](https://github.com/systemed/mod_mbtiles/blob/master/mod_mbtiles.c#L55) to send empty tiles, because some clients don't like 204s. So this would be a great improvement.

I don't have a Maplibre build setup (yet ;) ) so can't test the code, but from briefly grokking the patch and the test, it looks good to me.

> From a distance it looks like OSRM is in "maintenance mode", which is obviously much better than being abandoned 18 months on, I think we can probably say that...