What do you have to do to carry a three-year-old child in the rear seat of a passenger car with two children already sitting in safety seats and it is impossible to install a third safety seat?

The regulations allow for an exceptional situation where a third child can be transported in the back seat without a safety seat. However, three conditions must be met simultaneously: two other children are already travelling in safety seats, it is not possible to install a third safety seat, and the child being transported is at least 3 years old and fastened with seat belts.