The Boston cyclists Union and Livable Streets are promoting cycle tracks for Commonwealth Avenue.
The bicycle industry’s Astroturf advocacy organization, Peoplefor Bikes, is asking people to sign a petition in support of them.
Not a good idea. Cycle tracks on Commonwealth Avenue won’t prevent the most common car-bike crashes (crossing and turning collisions, doorings — though some doorings will be replaced by walk-outs and other types of collisions). No treatment of any kind on Commonwealth Avenue can provide convenient and attractive bicycle routes through the Boston University campus. Paul Schimek has a different proposal for Commonwealth Avenue, and I have extended that to look at the more general issue of bicycle mobility around the campus.
Paul Schimek’s study of crashes on Commonwealth Avenue is published here: https://www.scribd.com/doc/240561402/Comma-Ve-Report-Sept-22
My comments on Commonwealth Avenue and the BU cmapus are online here: http://john-s-allen.com/pdfs/Allen_2014-10-11_comments.pdf