A Cat D car is a vehicle that has been written off by an insurance company in the UK, meaning that the cost of repair is greater than 50% of the vehicles total value. However, this does not necessarily mean that the car is badly damaged or unroadworthy to the point of being a scrap car. In fact, many Cat D cars are still 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. When buying a Cat D car, it is important to keep in mind that you are buying a vehicle that has previously been written off by an insurance company, and it may have a chequered past. These cars can be more difficult to insure, and there may be less potential car buyers for a Cat D car due to the increased risk the buyer has to take on.