This interactive area chart visualizes monthly car crash counts in New York City from July 2012 through September 2025, using data from a local CSV file. A purple line and filled area show the trend, while hovering over the chart displays a vertical guide line, a highlighted point, and the exact crash count and month in a large text label. The visualization uses d3.scaleTime, d3.scaleLinear, d3.line, d3.area, and d3.bisector to map data, render shapes, and locate hovered points, with d3.pointer tracking mouse position.