Adaptive cruise control was active in six highway crashes by the end of October 2026, but those crashes killed eight people, exceeding the recent three-year average of five annual deaths. Korea Expressway Corporation said ACC-related crashes from 2023 to 2025 had a 62.5% fatality ratio, compared with 10.3% for all highway crashes, while manuals warn that the system may fail to recognize stopped vehicles, temporary work zones or objects with unclear rear profiles.
In reported cases, drivers failed to notice a stopped maintenance vehicle or a traffic queue in time, prompting the corporation to stress that ACC is a driving aid rather than autonomous driving and that motorists must keep their hands on the wheel and watch the road ahead.