If you sell off a personal vehicle, or two, or three, you do not need any special licensing. However if you are a used car dealer you do. So how does the government determine which it is?
Are there strict limits or guidelines such as number of cars sold, how long you have owned the vehicle prior to sale, etc., or is it basically up to a government agent's discretion of whether to count you as dealing used vehicles without a license or just someone who has sold a lot of his/her cars if you are buying and selling vehicles?