Chapter 10. Suspensions CAB Card and Expiration Decal Enforcement The original cab card must be carried in the vehicle at all times. Enforcement personnel refer the original cab card for proof that the vehicle is properly registered. * The apportioned license plates should be mounted on the front and rear of all apportioned vehicles with the exception of trailers where one plate on the rear is acceptable. * Massachusetts IRP qualified vehicles not displaying the current apportioned license plate and Cab Card or valid temporary authority will be in violation of Massachusetts law when traveling into other IRP jurisdictions. * You will receive two expiration decals. You must place the expiration year decal appropriately in the top right-hand corner of the rear and the front IRP apportioned license plates. 04/16