How often does a C1D driver's license need to be reviewed?

[McJeffrey]

C1D is a combined driver's license that includes both a C1 license and a D license. The upgraded C1D driver's license is equivalent to a newly obtained C1 license and does not require annual review. Both the C1 and D driver's licenses have validity periods divided into three types: 6 years, 10 years, and long-term validity. For the C1D license, the first review is conducted in the sixth year after initial issuance, and the second review is conducted ten years after the first review. Regulations on the timing of reviews: The first review for a passenger car is conducted when it reaches six years. Non-operational small and micro passenger vehicles, including family cars that are over 6 years but less than 10 years old, require a review every two years. For vehicles that have just reached six years, the review requires driving the vehicle, carrying the ID card, vehicle registration certificate, vehicle and vessel tax or tax exemption certificate, and compulsory traffic insurance policy to the inspection station for vehicle testing. After passing the inspection, a certification form will be issued, and finally, this form along with the carried documents must be submitted to the relevant window to obtain the annual inspection sticker.