What is the difference between a C1 and C1D driver's license?

[Athena]

The difference between a C1 and C1D driver's license lies in the types of vehicles they permit the holder to drive. Compared to C1, the C1D license includes an additional D license, which allows the holder to drive ordinary three-wheeled motorcycles and E-type vehicles. C1 Driver's License: The C1 driver's license is one of the codes for motor vehicle driving licenses. The C1 license permits the holder to drive small and mini passenger vehicles, light and mini cargo vehicles, as well as light, small, and mini special-purpose vehicles. Small passenger vehicles must have a seating capacity of 9 or fewer people. Age Requirements: The minimum age to apply for a C1 driver's license is 18 years old, with no upper age limit. However, applicants aged 70 or older must pass tests assessing memory, judgment, and reaction abilities. Physical Examination Requirements: Motor vehicle drivers aged 70 or older (including 70) must undergo an annual physical examination, while those under 70 do not need to.