What does the downgrade of a driver's license to C1M mean?

[McCecilia]

After the downgrade of a driver's license, it is generally reduced to C1, as currently, the C1 license can be used for a lifetime if physical conditions permit. The change to C1M often occurs because the driver's license has an additional M-class vehicle type, and there is no further downgrade available for the M license, so it naturally comes with it. The C1M license can be considered a combination of the C1 and M licenses. The C1M license can be seen as a combination of the C1 and M licenses, adding the M-class vehicle type to the C1 driver's license. Among them, the C1 license allows driving small cars, while the M license permits the operation of wheeled self-propelled machinery. C1: Small cars and small automatic transmission cars, low-speed trucks, three-wheeled cars. Small and micro passenger cars, as well as light and micro trucks; light, small, and micro special-purpose vehicles; small passenger cars with a seating capacity of 9 or fewer. M: Cars, tire cranes, road rollers, tractors, harvesters, and dedicated construction machinery, etc.