To unintentionally drive a common route. To turn on the mental autopilot and arrive toward a location other than your desired destination. For example, if you set out to drive to the store, but after a few minutes find that you are halfway to your place of work.
If I'm not careful, I end up driving the bus to work on Saturday mornings.
The act of having sex doggie-style, where the man's hand is resting on the female's lower back or upper rear-end. The combination of the two often results in a motion which resembles using the large steering wheel on a school bus.
Hey Dale, were you driving the bus last night or did you just go missionary the whole way?