How long after upgrading to a B2 license can one drive on the highway?

[MackenzieAnn]

After upgrading from C1 to B2, there is a one-year probationary period during which the driver cannot drive vehicles permitted by the B2 license alone on the highway. They must be accompanied by a driver who has held a corresponding or higher-level driver's license for more than three years. Here are the detailed explanations: After upgrading from C1 to B2, there is a one-year probationary period. During this period, if the driver operates a motor vehicle on the highway, they must be accompanied by a driver who has held a corresponding or higher-level driver's license for more than three years. Additionally, while driving during the probationary period, a standardized probationary sign must be displayed or hung at the rear of the vehicle. Note: If driving vehicles permitted by the C1 license, one can drive alone on the highway.