As cities are densifying, low-car neighbourhoods are increasingly seen as a solution to reduce car dependency, improve public space, and encourage alternative mobility options. This study examines the impact of such a development by evaluating the mobility behaviour and perceptions of residents in Cartesius, a newly developed low-car neighbourhood in Utrecht. Using a revealed preference approach, this research analyses survey data (N=70) and qualitative insights from conversations with residents to explore the influence of residential self-selection on mobility adaptation. Findings indicate that even non-self-selected residents—those who did not actively choose a low-car environment—reduce car ownership and car use while increasing reliance on public transport and shared mobility. This suggests that well-designed low-car policies can influence travel behaviour beyond pre-existing preferences. Meaning that large-scale low-car policies could be viable for a broader population beyond those who actively choose this lifestyle.