Chapter 7-1 Commercial License Restrictions Restrictions The RMV may apply any of the following restrictions to a passenger and/or commercial vehicle license: These restrictions are indicated by code letters on the front and back of the license: Commercial K - CDL Intrastate Restriction - Under Age 21 L - No Air Brakes Restriction M - Except Class A Bus Restriction N - Except Class A & B Bus Restriction O - Except Tractor Trailer Q - CMV Inspection Only Restriction. S - Proof of Current Blood Sugar Level W - CMV Intrastate Only with Medical Waiver V - CMV Interstate - Federal Medical Variance Who Issues the Restriction The V Restriction is added to (or removed from) a license by the Medical Affairs Branch (MAB). The federal government notifies MAB when a variance is issued to a customer, or when the variance expires or is rescinded. MAB will inform the customer if anything further is needed from them. 12/11 7:5