This map comes from the June 2006 City of Detroit Non-motorized Transportation Master Plan. The report notes the need for more bicycle parking and bike lanes (395 miles), all of which would be incrementally added as regular maintenance and upgrades occurred.
Among the many ideas and proposed plans, the report called for Mayor Kilpatrick to convene a Non-motorized Taskforce to implement, educate, and use of a new non-motorized system.
Streets should be swept regularly, with priority given to those with higher bicycle traffic. (Page 43)