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Before widespread automated driving, driver assistance systems become more common and can deliver safety benefits. This study focuses on current and future lane keeping assistance (LKA) systems and their potential safety effects by analysing real-world crash data and LKA's possibilities to prevent fatal passenger car crashes. The analysed data includes in-depth analysis of 364 fatal head-on and single-vehicle crashes in Finland. According to statistical analysis, 27% of these crashes could potentially have been prevented had currently available LKA been deployed. In this study, many issues are examined related to the lane markings' visibility, infrastructure, weather, and driver-related risks, which rationalise the results, compliment previous research, and highlight possibilities to increase the safety potential of LKA. Related to the lane markings' visibility, safety potential could be improved by allocating more …