If the system is unable to correct the lane departure (because the curve is too sharp, for example), the system will additionally warn the driver through a steering wheel vibration. (euroncap.com)
Plus, it can intervene actively to help correct lane drift and understeer or oversteer slides. (autoweek.com)
For example, some luxury vehicles offer automated parallel parking controls, warnings to correct lane wandering and automatic braking to avoid obstacles ahead to help human drivers reduce their chances of crashing. (texasdrivesafe.com)