4.2. The Conditions in the Vehicles 4.2.1. 4.2.2. 4.2.3. 4.2.4. Persons deprived of liberty shall be transported only using vehicles designated specifically for such purpose.  There have, for example, been cases when persons deprived of liberty were transported using the personal vehicles of PHAP staff. The surface area per person in a cell of the vehicles designated for transporting persons deprived of liberty shall exceed the minimum of 0.8 square meters. To this end, the transportation of persons in vehicles containing cells with a surface area of 0.5 square meters or 0.4 to 0.5 square meters shall be ruled out. The cells inside vehicles shall have ventilation, natural light, and temperature appropriate to the weather conditions. The domestic legislation shall prescribe criteria on the surface area, lighting, ventilation, and other aspects of cells inside special vehicles, and their practical implementation shall be secured. 54