This pie chart shows the distribution of vehicle types in a dataset, with each slice colored and paired with a legend. The visualization is built using D3.js v7 and rendered as SVG, with the pie geometry computed by `d3.pie()` and drawn using `d3.arc()`. Data is loaded from a remote CSV file, aggregated with `d3.rollup()`, and colored using `d3.scaleOrdinal(d3.schemeTableau10)`. The chart includes axis labels and hover tooltips, though the code erroneously mislabels the categorical pie slices as X and Y axes.