When leaving your car, how do you secure it against unauthorised use?

You are correct in choosing to lock the doors and close the windows when leaving your car. According to German traffic rules, securing your vehicle against unauthorized use involves making it difficult for others to enter or operate the car without permission. Locking the doors physically prevents easy access, while closing the windows eliminates open entry points. Activating the child-safety lock is intended to protect children inside the car and does not prevent unauthorized entry from outside, so it is not considered a primary measure for securing the vehicle. Always ensure your car is properly locked and windows are shut to prevent theft or unauthorized use.