Stay in your lane. Defensive driving means letting others go ahead of you and not defending your position in traffic. Avoid the urge to be a vigilante (“Oh yeah? Let me show you what it’s like to be cut off like that!”) and stay away from weaving and cutting others off by sticking to your lane. Accept the fact that someone is always going to think they’re in more of a hurry than you. These are the drivers you want to move far away from. Don’t be tempted to “teach them a lesson” – it won’t work.
In general, avoid the left lane. It’s where most accidents happen. You also have more “escape routes” in the right lane should a problem suddenly arise that requires you to quickly change lanes or pull onto the shoulder.