Show tertiary roads on lower zoom levels

[yo-han]

I read about a similar issue already but It seems the code has changed a bit since then.

I'm working on a bicycle map and want to show tertiary at lower zoom levels as they are way more important to cyclists then highways. The problem is I can't really find any tutorials or info explaining where to start. I made some changes to the transportation layer mapping.yaml and transportation.sql without any luck. Anyone who can point me in the right direction?

[yqx674834119]

I had the same problem. I want to know which file I should modify to achieve a custom zoom level.

[yo-han]

I did a quick and dirty fix for now which seems to work in the transportation.sql file. On row 377 I added these lines to the where clause:

...
WHERE NOT is_area
  AND
     WHEN zoom_level = 10 THEN
        CASE WHEN transportation_filter_z12(hl.highway, hl.construction) THEN TRUE
        END
     WHEN zoom_level = 11 THEN
       CASE WHEN transportation_filter_z12(hl.highway, hl.construction) THEN TRUE
       END
...

It does something but I'll keep looking for better solutions.

[nitrag]

Looking to do the same... Bueler?