Beatrice was driving like a very slow lunatic. She went twenty-five miles an hour on the highway and kept drifting across lanes so the other cars honked and swerved and ran into guardrails and stuff.
Does "drift" mean a "slow steady movement from one place to another"? Well, I know that there is a motorsport that is called "drifting", but I think that this is not the case. But I believe that when you are in this motorsport, you drift the car, I suppose.