Mitsubishi Evo X rolls in a corner

Roll is the outward lean of a vehicle in cornering.

Roll occurs when the centre of gravity of the vehicle is above the roll axis, an imaginary line about which the car tilts. This is almost always true.

Hydraulic systems like Citroen's Hydractive can be set up to eliminate roll or even tilt a vehicle inwards (as used on the Mercedes F300 Life-Jet and tilting trains such as the Pendolino).

Compare pitch and yaw.