Driving in a dream usually centers on autonomy -- how much say you feel you have over the direction your life is taking. Being in full control of the wheel can reflect confidence in your choices, while losing the brakes or riding in someone else's car often points to a decision that feels out of your hands right now.
The vertue of a Planet is in that House, whose beginning or cusp a Planet precedes by no greater space than five degrees. - William Lilly (1602.-1681.)