If someone cuts you off, slow down and give them room to merge into your lane. Driving slowly in the left lane. If you are in the left lane and someone wants to pass, move over and let them by. In many states and provinces the law requires you to travel in the right lane and use the far left lane only for passing. Besides, it's simple courtesy to move over and let other drivers by.
Drivers get angry when they are followed too closely.
Allow at least a two-second space between your car and the car ahead. If you think another car is driving too slowly and you are unable to pass, pull back and allow more space, not less. That way if the car does something unexpected you will have time to get out of the way. You should be able to see the headlights of the car behind you in your rear-view mirror. If you feel you are being followed too closely, signal and pull over to allow the other driver to go by.