Imagine this. You're driving your pickup late at night. You're in the left lane of a 6-lane highway. There's only one other car in sight, and it's in front of you, also in the left lane.
You're going quite a bit faster than the car, and just about the time you start to wonder if the driver is going to move to the right and let you pass, for no apparent reason he slams on his brakes for a couple seconds!
You manage to hit your own brakes hard enough and quick enough that you avoid running into the car. Then, the car moves right one lane, allowing you to pass. Your heart is pounding because of the near-accident.
What would you do?