This smoothed radar chart compares French railway stations across seven service-quality criteria, including cleanliness, security, accessibility, and passenger information. Users can select one or two stations to overlay their performance profiles, with each axis normalized to a 0–10 scale and a composite score calculated from the weighted attributes. Built with D3 v4, the visualization uses the SVG rendering pipeline to draw curved, semi-transparent polygons, and includes a glow filter and animated transitions for interactive feedback. The underlying data comes from a CSV file containing station attributes and traveler satisfaction metrics.