The most important thing you can do when dealing with an aggressive driver is _________.

What You Should Do When Confronted by Aggressive Drivers?
First and foremost, make every attempt to get out of their way.
Put your pride in the back seat. Do not challenge them by speeding up or attempting to hold-your-own in your travel lane.
Avoid eye contact.
Ignore gestures and refuse to react to them.
Report aggressive drivers to the appropriate authorities by providing a vehicle description, license number, location and, if possible, direction of travel.
If you have a cellphone, and can do it safely, call the police.
If an aggressive driver is involved in a crash farther down the road, stop a safe distance from the crash scene, wait for the police to arrive and report the driving behavior that you witnessed.