This example visualizes parking facility capacities from RDW data as a bar chart, with each bar representing a location. A checkbox filters out entries with unknown capacity, dynamically updating the chart. Built with D3 v6, it uses `d3.scaleBand` for the x-axis, `d3.scaleLinear` for the y-axis, and SVG for rendering. The code loads local JSON data and demonstrates interactive filtering through D3’s selection and update patterns.