Vancouver City Hall has opted to remove all of the door knobs in the building and replace them with levers. This might seem like a waste, but consider that all City Halls are facilities frequently used by the public. Designing spaces for public use requires the designer to recognize the need for Universal Design. Universal Design produces spaces that are accessible for all members of the public, regardless of ability. Not only are they doing this at City Hall, but they have passed an accessible housing bylaw that requires all new buildings to include levers instead of knobs.
The story was published here: http://ca.news.yahoo.com/blogs/dailybrew/doorknobs-banned-vancouver-homes-could-city-next-194226250.html
For more information regarding Universal Design, please visit http://udinstitute.org/