Although as passengers we may never realize, an airplane almost never follows its predetermined flight path. About a thousand times a second, the autopilot calculates the difference between where the plane is and where it is supposed to be and issues corrective action to the pilot who is always hyper-alert. The same analogy can be used for driving. Even if it’s a straight road, if you doze off or take your hands off the steering wheel, even for a millisecond, you can drift out of the lane and r...