This proportional symbols map displays transportation costs for each US state, with the circle size encoding the cost amount and the color indicating whether a state ranks in the top ten most expensive. Rendered as an SVG via D3 v7, the visualization uses the `d3.geoAlbers` projection for the contiguous states, with separate `d3.geoMercator` projections for Alaska and Hawaii. State cost data is loaded from a Gist CSV, and the `topojson.feature` API draws state boundaries while circles are positioned using the `projection` function.