This interactive bar chart displays the number of P+R parking places for each city in the Randstad region of the Netherlands. Users can toggle a checkbox to combine parking capacity data for cities with multiple locations, updating the visualization. The chart uses D3 v6 with SVG rendering, employing `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to create and update bars. Data is fetched from a GitHub gist and processed through custom transformation functions that clean, filter, and aggregate the raw dataset.