At what monthly interval must trucks with a permissible total mass exceeding 3.5 t be presented for official inspection (Hauptuntersuchung)?

Trucks with a permissible total mass exceeding 3.5 tons in Germany must undergo an official inspection, known as Hauptuntersuchung, every 12 months according to the Straßenverkehrs-Zulassungs-Ordnung (StVZO). This regulation ensures that vehicles remain safe and roadworthy. Regular inspections help in identifying potential safety issues, ensuring compliance with environmental standards, and maintaining the overall quality of the fleet on the roads. It's crucial for operators to adhere to this timeline to avoid penalties and contribute to road safety.