What do the restriction codes on an LTO driver’s license mean?

The codes show which vehicles you’re allowed to drive. A is for motorcycles, B is for regular cars and SUVs, B1 is for vans carrying 9 or more passengers, and B2 is for light trucks up to 5,000 kg. C is for heavier trucks, and D is for buses. Your license may also be marked automatic-only (AT) if you took your practical exam in an automatic car, which means you can’t legally drive a manual.