Render pedestrianized areas in light grey.
Render barriers as faint lines of various styles.
Render highways in tunnels with a transparent effect.
Consider highway="pedestrian" to be a synonym for highway="footway".
Add the barrierlines data file to the project.
Show the names of uninteresting highways, but fade them.

Previously we didn't show them at all, but I imagine they could actually
be useful if e.g. you're navigating and you see a street sign for them
as you pass.
Shrink the size of footway names to be more consistent with the line size.
Update our OSM extract.