What is the primary pedagogical goal of 'Curriculum Progression from Simple to Complex' (Vom Einfachen zum Schweren) in driver education?

1. To maximize the total number of paid driving hours
2. To ensure the student drives only in empty parking lots for the entire curriculum
3. To prevent cognitive overload (kognitive Überlastung) by automating foundational vehicle handling skills before exposing the learner to complex multi-hazard traffic environments
4. To prevent the instructor from having to talk during lessons