Where are you allowed to park motor vehicles with a permissible total mass exceeding 7.5 t in built-up areas regularly on sundays and public holidays and between 10 p.m. and 6 a.m.?

Your answer is correct. Motor vehicles with a permissible total mass over 7.5 tons have special parking restrictions within built-up areas. Regular parking on Sundays, public holidays, and at night between 10 p.m. and 6 a.m. is allowed only in industrial areas or on specially designated parking spaces in health resorts and hospital areas. Parking in wholly residential areas is not allowed for these heavy vehicles at these times, regardless of road width, to avoid noise and disturbance to residents. This rule helps ensure peace and quiet in residential environments during nighttime and on days of rest. Always check for specific parking signs that permit or restrict truck parking in these areas.