We have seen it time and time again. A driver makes a mistake and cuts off another car, or worse, a motorcycle. The inconvenienced driver gets aggravated that the other could be so inconsiderate and reckless. This leaves to some aggressive driving to "get back" at the first driver until both vehicles pull up to a light and screaming turns into a street brawl.
Or, you can be civilized. What a crazy concept! This driver didn't see a motorcyclist and changed lanes in front of him. The motorcyclist, calmly changes lanes and goes around. When the get to the next light, the driver does the unthinkable. He apologizes for not seeing the bike. And everyone drives away happy. What a world.