motorway tunnels are nearly invisible on z13 and lower

[matkoniecz]

see http://www.openstreetmap.org/#map=13/-27.4119/153.0457 for an example, compare Airport Link and M1

May be affecting also other road types

railways have no special tunnel rendering from z12 - see http://www.openstreetmap.org/?mlat=50.4397&mlon=19.9992#map=12/50.4397/19.9992

[pnorman]

This is probably specific to motorway tunnels on land. See

Anyone aware of a tunnel on land that's not under a bunch of other roads?

[matkoniecz]

http://www.openstreetmap.org/?mlat=46.6437&mlon=8.5779#map=12/46.6437/8.5779 or http://www.openstreetmap.org/?mlat=46.5233&mlon=8.3273#map=12/46.5233/8.3273 (Alps)

Here is basically only tunnel and in this case it is well visible.