Roads covered up by subway stations

[dlaw]

I noticed a few sections of major roads which were oddly missing from toner maps. Zooming in, it appears that these roads are missing because they are "covered up" by underground subway platforms.

Here is an example -- Central Square in Cambridge, MA, USA:

Zoomed in, showing subway station drawn atop the street
http://maps.stamen.com/toner/#17/42.36521/-71.10371

Zoomed out, subway station not visible -- but a chunk of Massachusetts Avenue is missing
http://maps.stamen.com/toner-lite/#15/42.3652/-71.1037

What I would have expected to see -- subway station rendered beneath the major surface road
https://www.openstreetmap.org/#map=18/42.36527/-71.10381

Cheers!