Now Karl in GTA San Andreas can sell his cars to passers-by on the street. To do this, press "Ash" (H) and you will see how one passerby runs to your car and gets into it. After the passerby got into the car, a dialogue will be shown about how much money the passerby will give for this car. To sell, press the "Y" key, then further dialogues will be shown and soon Karl will receive the money and get out of this car, and a passerby will sit in the driver's seat and drive on. But if you pressed the "N" (Do not sell) key, then the dialogues will go on and soon the passerby will get out of the car and go further down the street on foot.