{"version":"1.0","type":"rich","title":"In-place vs loose density of loam and topsoil (FHWA)","description":"This interactive D3 v7 chart compares in-place (bank) and loose densities for four FHWA earth materials—dry, damp, and wet loam, plus topsoil—displayed as filled and open circles per row, with bank-to-loose ratios on the right. Users toggle between lb/cu yd and kg/m³ units via radio buttons. The SVG uses `d3.scaleBand`, `d3.scaleLinear`, and `d3.axisBottom`, with data from the US Construction Estimating Constants dataset and FHWA’s Exhibit 5.1 A.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/fe2544b4b3f44841a01462cc43190de7?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}