This interactive bar chart shows the number of P+R parking places for cities in the Randstad region of the Netherlands, sourced from NPR park-and-ride data loaded via a gist URL. A checkbox toggles between showing individual parking facilities and combined totals per city, which updates the visualization. Built with D3 v6 in SVG, it uses `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` for the axes and bars, with data cleaning and merging handled through custom functions in a transform module.