Ride the City is an application that helps bicyclists find safer routes around cities.
http://www.ridethecity.com/chicago

Active Transportation Alliance – Chicagoland’s voice for better biking, walking, and transit. A member-supported nonprofit transporation advocacy group, formerly the Chicagoland Bicycle Federation
http://www.activetrans.org/

“Biking” by Lee Crandell is licensed under CC BY