Hi cubbe8, Thanks for all your contributions to Cambridge recently. 

As a heads up, the OSM conventions for bike lanes are not the ones you're using here. Only a "cycle track" that is physically separated from the roadway should get its own path (like the one on Ames). This bike route on Broadway is a "cycle lane" within the roadbed, so it should be defined with a cycle tag on the roadway (i.e. Broadway). As you'll see if you query the feature, this is already marked.

Full documentation is here: https://wiki.openstreetmap.org/wiki/Bicycle

I was also initially confused by this because non-separated cycle lanes are not rendered in the OSM default. But you'll find the known cycling routes clearly defined here: https://www.cyclosm.org/#map=17/42.36350/-71.08766/cyclosm. Note that the Broadway lanes are duplicated.

Most bike routing applications use these conventions, so please check them out! 