3. Participant observationFor additional information cpikas@umd.edu The poster will be posted to http://www.slideshare.net/cpikas.Updates on the study will be posted to twitter (@cpikas) and my blog at http://scientopia.org/blogs/christinaslisrant. Courtesy WSDOT cc by-nc-ndhttp://www.flickr.com/photos/7821771@N05/4008614741/ Courtesy kevinzim cc by http://www.flickr.com/photos/86624586@N00/10199206