What is the pedagogical purpose of 'Commentary Driving' (Kommentierendes Fahren) during practical driver training?

1. The instructor continuously narrates every control input while the learner remains silent
2. The learner repeats memorized traffic rules without connecting them to current observations
3. The learner names only road signs after passing them, without stating hazards or intended action
4. The learner speaks aloud their visual observations, hazard assessments, planned actions, and speed adaptations, making their cognitive processes transparent to the instructor