Have you seen it? A car swerves to avoid a slightly raised manhole or a pothole or a bump in the road. Actually, it is not typically a bump but rather a depression, a recess, an emptiness where asphalt or concrete should be and once was. More accurately, the car does not swerve by itself. The driver swerves it to avoid the offending disturbance. I've done it. Haven't you? Why do we do this? To save wear and tear on our tires? To achieve a less-rocky ride, avoiding In-Vehicle Beverage Spillage (IVBS) or CD skippage? Do we perform this evasive driving maneuver to keep the driver from losing his or her train of thought? (Maybe it should be "car of thought" in this case.)
Can you as a reader apply any metaphorical value to this phenomenon?