This interactive bar chart displays the number of P+R parking spaces in cities across the Randstad region, sourced from a JSON endpoint. Users can toggle a checkbox to aggregate parking capacities for each city, combining data from multiple locations within the same municipality. The visualization is built with D3 v6, using `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to render and update SVG bars, enter/exit selections, and refresh the axes dynamically.