Don't engage in road rage - it's not worth it. No different than if you were driving a car. This is a route that you will be taking at the same time every work day with your commute, so you will be seeing a lot of the same cars and they will be seeing you. Use the opportunity to establish a good cycling relationship with them and stay "zen" with the occasional a**hole. Enjoy the ride and focus on the many more positives in your commute.