Last year, in their Downtown Bicycle and Pedestrian Gap Analysis (http://www.cityofnewhaven.com/TrafficParking/pdfs/GapAnalysis2009.pdf), Nelson\\Nygaard Consultants recommended a physically separated bike lane—or cycle track—on Elm Street. How would you design such a facility? View a 3D mock-up of two potential designs here and offer your suggestions. Don't like it? Download Google SketchUp to your computer here: http://sketchup.google.com/ and then download my drawings here: http://www.box.net/shared/z8e1db4ssq and give it your best shot.
For cycle track design guidelines and best practices, have a look at this design guide from the National Association of City Transportation Officials: http://nacto.org/cities-for-cycling/design-guide/cycle-tracks/
and this report from bicycle-oriented transportation planning consultants at Alta Planning: http://www.altaplanning.com/cycle+tracks.aspx