Where are you allowed to park a trailer with a permissible total mass exceeding 2 t in built-up areas regularly on sundays and public holidays and between 10 p.m. and 6 a.m.?

The correct combination of answers for where you are allowed to park a trailer with a permissible total mass exceeding 2 t in built-up areas on Sundays and public holidays, and between 10 p.m. and 6 a.m., consists of options 1 and 2.

1. In industrial areas: These areas are typically less densely populated and allow for more flexible parking rules, making it acceptable to park larger vehicles like trailers.
2. In wholly residential areas, on specially designated parking spaces: Specially designated parking spaces are set up to accommodate residents and visitors, even for larger vehicles, thus permitting parking under certain conditions.

Option 3, which refers to special areas reserved for recreation purposes or sufficiently wide roads, is not valid in this scenario because it does not align with the specific regulations governing the parking of larger trailers in built-up areas.

Understanding these rules is essential for ensuring compliance with traffic regulations and avoiding fines or penalties. The regulations are designed to maintain order and safety in residential and industrial areas by clearly defining where larger vehicles can be parked.