Why It Works
The clever use of hollow orange proportional symbols for fatalities and solid gray circles for serious injuries allows us to see subtleties that would have been masked had the data been aggregated. Reusing these colors in the charts creates a connection with the map and shows accidents over time. The simple color palette, in conjunction with a muted basemap, sets the tone and aligns with branding for the City of Portland and the Portland Bureau of Transportation. This map grabs our attention, feels approachable, and imparts knowledge.