How is the validity period of the driver's license calculated after merging C1 and D licenses?

[StReed]

Here is an introduction to the validity period of the driver's license after merging C1 and D licenses: 1. Motor vehicle driver's license: The "initial issuance date" of the motor vehicle driver's license remains unchanged forever and is also the starting date for calculating the validity period of the license. 2. Driver's license after merging permitted vehicle types: For the driver's license after adding (i.e., merging permitted vehicle types), when handling related procedures (such as annual review, violation exams, etc.), the highest permitted vehicle type recorded on the license serves as the standard for processing. 3. Driver's license: The C1 driver's license is one type of motor vehicle driver's license code. The permitted vehicle levels for a C1 license include (all models under C2, C3, C4) small and micro passenger vehicles, light and micro cargo vehicles, and light, small, and micro special operation vehicles. The exam subjects include four items: traffic regulations and related knowledge, field driving, road driving, and safe and civilized driving knowledge. The D driver's license is another type of driver's license, with permitted vehicle types including ordinary three-wheeled motorcycles and the vehicle types permitted by E and F licenses.