What does mean cdl permit class a restriction l on oklahoma?

In Oklahoma, a CDL permit Class A restriction L means the driver is authorized to operate a commercial motor vehicle with a gross weight of 26,001 or more pounds, if the vehicle is equipped with an air brake system and the driver has obtained a Restricted Commercial Learner's Permit (RCLP) for Class A.

Additionally, the driver is only allowed to operate the commercial vehicle under the supervision of a licensed Class A commercial driver who is occupying the seat next to the driver and who is authorized to operate the vehicle being operated.