drive off means to leave in a car (e.g. A woman got into the car and drove off without saying anything.)
drive on (or walk on, play on) means to continue driving (e.g. We have to stop at this gas station, if we want to dive on to London today.)
drive off means to leave in a car (e.g. A woman got into the car and drove off without saying anything.)
drive on (or walk on, play on) means to continue driving (e.g. We have to stop at this gas station, if we want to dive on to London today.)