These may indicate the calling you have on your life, the vehicle of purpose that will carry you from one point to another. Cars, planes, buses, etc., may be symbols of the type or even the size of the ministry you are or will be engaged in. That’s why there are different kinds of vehicles. Note the color of the vehicle.
If it is a car, what is the make and model? Observe who is driving it. Are you driving or is someone else driving? If someone else is driving, who is it? Do you know the person? Is it a person from your past? If the driver is faceless, this may refer to a person who will appear sometime in your future or that the Holy Spirit Himself is your driving guide.