This example combines Leaflet and D3 to render a map of Worli, Mumbai, with hand-drawn streets and postal-code polygons overlaid on Esri World Imagery. Using D3 v6, it projects geographic coordinates with `d3.geoTransform` and `d3.geoPath` into SVG paths that are placed on Leaflet’s overlay pane, updating on map zoom events. Polygons and multi-linestrings from local GeoJSON files (polygon.js, lines.js) highlight lanes and district boundaries, while hover interactions fill shapes with red.