This stacked bar chart visualizes traffic flow across 27 lanes at an intersection, showing counts of pedestrians, non-motorized vehicles, and motor vehicles. The SVG rendering uses `d3.stack()` to create stacked segments for each lane category, with `d3.scaleBand` positioning the bars and `d3.scaleOrdinal` assigning colors from `schemeSet3`. A tooltip appears on mouseover, displaying the percentage each category contributes to the lane’s total. The data is embedded directly in the code, and the visualization includes axis labels and a custom legend.