This stacked bar chart visualizes traffic composition across six lane IDs at an intersection, breaking down counts of pedestrians, non-motorized vehicles, and motor vehicles. The chart uses D3 v6’s `d3.stack()` with `stackOrderNone` to layer the three categories, while `d3.scaleBand` and `d3.scaleLinear` position bars and encode counts. Rendered as an SVG within a React framework, the visualization applies `d3.schemeSet3` for categorical colors and labels axes with `d3.axisLeft` and `d3.axisBottom`. Data includes lane 4 as the busiest, with mixed traffic, and lane 5 empty.