PSU’s report on Portland’s green bike boxes, on which I was a co-author, has been released (in draft form): http://www.ibpi.usp.pdx.edu/bikebox.php. Among other things, the report finds that incidences of conflict between cyclists and motorists decreased with the bike boxes, while the number of cyclists and motorist right turning actions both increased. UT-Austin also recently released a report on bike boxes, coming to similar conclusions.
Shortly following the release of the report, Portland’s Bureau of Transportation (PBOT) announced 11 more intersection locations that would be receiving bike boxes over the coming year.
Some coverage of the bike box report and PBOT announcement can be found on BikePortland.org (PSU evaluation finds that bike boxes work and City unveils list of 11 new bike box locations) and the Oregonian (Portland plans 11 new green bike boxes in wake of PSU study).
I presented some preliminary findings on this research in a poster at the American Planning Association annual conference in New Orleans, LA in April 2010.