http://www.congestion.kytc.ky.gov/roaddiets.html
http://www.walkable.org/assets/downloads/4%20Lane%20Conversion.pdf
http://www.walkablestreets.com/diet.htm
http://publications.iowa.gov/2888/
http://www.mnltap.umn.edu/Publications/Exchange/2008-3/ResearchAnalyzes.html
http://www.urbanstreet.info/2nd_sym_proceedings/Volume%202/Knapp.pdf
http://www.iowadot.gov/crashanalysis/pdfs/ite_draft_4to3laneconversion_papersubmission_2005.pdf
There is lots more literature out there. Google “the conversion of four lanes”, or “road diets” to get started, and follow the links and citations in the articles. There are many many references to cold climate, snow climate, and Canadian city examples cited. And there are many studies on streets with a similar profile and even much higher traffic volumes than the section of Bronson north of Somerset.