The data used in this tool is available for download within this repository.
| File | Desc | Source/Notes |
|---|---|---|
| geo/ all_intersections.geojson | Point layer with named street intersections for Chicago | I created this using the city's street centerlines file, also available on the Data Portal. Some intersections have multiple points, particularly 6-leg intersections. |
| geo/ bikeroutes.geojson | Line layer denoting sharrows, bike lanes, and trails | Chicago Data Portal |
| geo/ commareas.geojson | Polygon layer of the city's defined Community Areas. These boundaries do not change frequently. | Chicago Data Portal |
| geo/ police_districts.geojson | Polygon layer of the city's police districts | Chicago Data Portal |
| geo/ wards2015.geojson | Polygon layer of the city's legislative districts. These boundaries change every 10 years after the Census. | Chicago Data Portal |
Summaries are available for each boundary type in either a CSV file or RDS for simple reading into R.
- idot_crashes/IDOT_2009_2017_Summary_{boundary}.{csv | rds}
Each row is a summary for the given geographic boundary and year, with a row each for separating pedestrian/cyclist crashes from other crash types.
For 2009 Community Areas, the records for the Uptown community area appear as:
| row number | commarea | year | ped_cyc | crashes | injuries_total | injuries_fatal | injuries_incapacitating | injuries_non_incapacitating | injuries_reported_not_evident |
|---|---|---|---|---|---|---|---|---|---|
| 1122 | UPTOWN | 2009 | no | 981 | 119 | 2 | 12 | 60 | 47 |
| 1123 | UPTOWN | 2009 | yes | 94 | 96 | 1 | 9 | 37 | 50 |
The total number of crash records for 2009 is 981 + 94 = 1075.
Each row is a crash report, which may involve a single or multiple persons/vehicles.
- idot_crashes/IDOT_Crashes_Chicago_2009_2017.rds