Tertiary roads more dominant than secondary on z10

[katpatuka]

On z10, tertiary roads (rendered gray) are somehow more dominant than secondary roads - see for example the secondary between Otlukbeli and Demirözü here: https://www.openstreetmap.org/#map=10/40.0363/39.9044.

[matthijsmelissen]

Probably related to #102.

[pnorman]

This example is not on landuse, so not a duplicate, but the root cause of both is probably the same, secondary not being distinct.

[matkoniecz]

Preview of early version of new road style - that should solve too low visibility of secondary.