Cat D refers to cars that have been written off by an insurance company in the UK, but the damage they have sustained may be relatively light. The cost of repairing the damage may not be high, and the car may not have suffered any structural damage. Even though the car is not economical for the insurer to repair, it may still be safe for driving after repair. Cat D cars can be repaired to an acceptable standard for less money than it would cost an insurance company, which is why they often reappear on the roads. However, buying a Cat D car means that you are buying a vehicle that has previously been written off by an insurance company, and it can have a chequered past. Cat D cars can be more difficult to insure, and they can have a lower resale value than other models with similar age, mileage, history, and documentation.