Temporary identity. Vehicles and their sizes represent power, potential and capabilities. Your transportation that will take you to a place of higher learning. Life is school, and the school bus is showing you that it is time to jump on the bus of learning and growing. Also, a nice bus driver shows that you are on the right path. If the driver is not nice, then you may be going in the wrong direction in life. You should be in control of the wheel of life yourself. Going uphill means things are looking up or you are going the right way. Going downhill is you going in the wrong direction and things will not be easy.
See Driving, School, Bus, Bus Driver, Mechanic, Control, Stop.