The driver of a vehicle in a dream can indicate influences in your life, guidance, or spiritual abilities you have. Whether in a car or not, a taxi driver indicates you have a counseling ability that works well one on one. It means this because taxi drivers take you from where you are to where you need to be on a one on one basis. In the same way, a bus driver indicates you are a group leader / teacher.
If the driver is a successful family member the dream tells you to listen to their guidance – let them sit in the driving seat for a while. If it is a member with difficulties, a parent or partner, it means you are not following your own direction in life and are letting others push you around either consciously or subconsciously.
