What is the benefit of using adaptive cruise control (ACC) on motorways?

Adaptive cruise control (ACC) helps maintain a safe following distance automatically by adjusting your speed to match the vehicle ahead. This assists the driver in keeping the chosen distance, which reduces the risk of rear-end collisions by adapting to changing traffic conditions. However, ACC does not guarantee that the safety distance can never be undercut; the driver must still remain attentive and intervene if necessary. Understanding this helps ensure safer driving on motorways while using ACC.