The Citroën DS featured a revolutionary hydropneumatic suspension system that combined hydraulic fluid and compressed nitrogen to provide an exceptionally smooth, self-leveling ride. Each wheel was supported by a hydraulic sphere that automatically adjusted to changes in road surface and load, keeping the car level under braking, acceleration, or uneven terrain. This system allowed the DS to glide over rough roads with unmatched comfort and stability, and its adjustable ride height let drivers r