speed (m/s)  ·  roughness — dB above the smooth-road floorⓘ

band panels — sub-bass · low · mid · high (dB)ⓘ

baseline (dashed) + green gap — delta-dB above the floorⓘ

faint amber — per-frame ~47 Hz roughnessⓘ

tag-event dots — hover a dot for an event's tagsⓘ

pink ribbon — likely talkingⓘ

Envelope — smoothed roughness trendⓘ

folded sub-bass — hue tonal→chaos, thickness = chaosⓘ

shaded bands — auto stops / rough / cruiseⓘ

…% of windows pinned at roughness 100ⓘ