This example presents a fork of a D3 tree map visualizing Bangalore traffic congestion levels across city locations. The visualization shows a hierarchical structure with parent nodes for traffic intensity (heavy, moderate, light) and child nodes for specific junctions, using different shapes and colors to distinguish node types. Built with D3 v7 and rendered as SVG, the code employs `d3.tree()` and `d3.hierarchy()` to compute the layout, while custom styling applies olive-green dashed links and color-coded nodes based on the traffic data. Additionally, supplementary paths connect select leaf nodes, representing cross-junction relationships within the traffic network.