The goal of the project was to investigate why drivers disengage driver assistance systems (ADAS), despitethe safety benefits they provide – a fundamental dilemma without a simple technical solution: effectivesafety requires early intervention, but early intervention is often perceived as disruptive and causes driversto disengage the systems. Through focus groups and a survey, we captured users’ experiences and attitudes. Six themes were seen asimportant for the user's experience of ADAS, 1) User experience, 2) Knowledge and mental models, 3)Technical limitations, 4) Trust and confidence, 5) System transparency, and 6) Driver autonomy.The results around user experience indicate that drivers appreciate relief during routine driving, especially onmotorways, where adaptive cruise control (ACC) is considered smooth and helpful in maintaining distanceand speed. Lane Keep Assist (LKA), on the other hand, is often turned off on curvy roads, where it isperceived as jerky or too intrusive. Systems such as Blind Spot Information System (BLIS) and Night Visionare perceived positively for their ability to consistently assist the driver in situational awareness. Negativeuser experience includes touchscreens that drivers consider distracting and unsafe compared to tactilecontrols, or warnings that the driver is not in control of driving when steering assistance is engaged onstraight roads. Lane-keeping systems are perceived to criticise the driver's intentional lane positioning, forexample at water on the road or in corners.Several of these phenomena are linked to Technical limitations, and drivers' knowledge of the systems does not always include the reasons for such limitations. This in turn affects drivers' trust, which is crucial for theuse of ADAS. Trust is built slowly through positive experiences but can be quickly destroyed by occasionalnegative events. ACC is generally trusted more than LKA, as it is considered easier and more predictable.This approach is also reflected in the survey results.