This pie chart visualizes the distribution of electric vehicles by vehicle segment, showing the count of EVs in each category. Built with D3 v7, the code loads a CSV dataset from a GitHub Gist and aggregates segment counts using `d3.rollups`. The chart applies a pie layout with `d3.pie()`, generates arc paths via `d3.arc()`, and colors slices with a `d3.scaleOrdinal` using `d3.schemeSet2`. Labels are placed at arc centroids, and a legend accompanies the SVG rendering.