A regular driver is someone who drives a vehicle on a consistent or frequent basis, as part of their normal routine. This could mean driving to work, running errands, taking children to school or activities, going shopping, etc. A regular driver may have a specific car that they use for these purposes and may be skilled in the operation of that vehicle. The term "regular" implies that this is something that the person does on a routine basis, as opposed to someone who only drives occasionally or sporadically.