This specialized book provides a comprehensive analysis of the duty of care on private properties, particularly concerning liability towards unauthorized users. The work begins with an introductory presentation of general traffic obligations, addressing historical developments, reasons for their emergence, and the limits of these duties. A central theme is the definition of unauthorized entry onto a property. The subsequent sections examine the conditions under which a duty of care also applies to unauthorized intruders. Excursions into case law and the permissibility of intentional risk creation offer additional perspectives. The book also explores liability in the context of playing children and analyzes relevant decisions from various courts. The juxtaposition of case law and scholarly opinions allows for a nuanced examination of the topic and provides suggestions for resolving conflicts of interest between those responsible for safety and intruders.