Chicago's Green Alley program is one of many environmentally friendly initiatives put forth by CDOT.
Green alleys incorporate a variety of characteristics:
Other green alley techniques include using proper grading and pitch to facilitate drainage, and using dark sky-compliant light fixtures to reduce light pollution and provide uniform illumination.
Green Alleys are part of CDOT's "green infrastructure" -- which includes recycled construction materials, permeable pavements and other efforts.
The program began as a pilot in 2006, and through 2010, more than 100 Green Alleys have been installed.
The handbook below provides an overview of CDOT's Green Alley program.