This interactive map displays motor vehicle crash locations across New York City's five boroughs, with each borough filled with a distinct color. A legend allows users to hover over borough names, fading non-selected areas to highlight crash density in a specific region. The visualization uses React with d3.geoMercator and d3.geoPath to project TopoJSON boundary data from `nyc_boroughs.topo.json` into SVG paths. Crash points from a CSV file are rendered as small black circles, with positions calculated via the projection function.