This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car makes. Each circle’s position maps horsepower (x-axis) and torque (y-axis), while its radius and color encode highway MPG using a linear scale and the viridis interpolator. The chart uses d3.csv to load data, d3.scaleLinear for axes and sizing, and d3.scaleOrdinal for color mapping. Interactive tooltips appear on mouseover, and a legend demonstrates the MPG-to-radius relationship through labeled circles and dashed segments.