This is a KMZ map file, which was made using Chicago Police Department files. It was created by me, as copied from those files and not from the Chicago Police Department.

"The grid system, widely used by municipalities and private refuse haulers, changes collection routes from non-linear ward geography to a system of routes bordered by main streets and natural boundaries. The service model concentrates sanitation workers in targeted areas of the city each day and creates balanced service regions to improve daily collection performance."