Don’t be an a$$wipe in traffic. Let them in when someone attempts to merge into traffic from an on-ramp or is trying to change lanes.
This goes both ways. Don’t be the person who cuts in front of others when merging into traffic or uses the shoulder to bypass the cars in front of you. This makes you a di@k.
And as far as flipping someone off–please explain how that helps the situation. Trust me, I live in California, and traffic is bad almost everywhere I travel. That’s why I always have a good podcast or book on tape at the ready.
You know the Golden Rule. Employ it!