Police-issued bike citation data are from the Chicago Police Department, and parking citation data are from the Chicago Department of Finance. The addresses provided to the Tribune often did not contain a street type (street, avenue, boulevard, etc.). For citations where there is both a street and place (for example 71st Street and 71st Place) the address was plotted on the street. Bike citation data were generalized to the block level. Those citations were mapped to the center of the block. If the mapping software failed to locate the address, the citation was discarded, which amounted to fewer than 3 percent of all citations not being shown.