growth, even if your immediate reactions are heated.
One of the most encouraging things I've read about this is by Tara Brach, a well-respected Buddhist teacher and psychologist that leads the Insight Meditation Community of Washington. After decades of serious dedicated training, including at an ashram, she concedes humbly that her mind still jumps to judgment, and that she has come to accept that that will likely not change, so the work is to spot it and move through it as intelligently as she can each time.
Her weekly group meditation/teachings regularly draw about 200 people and you can listen to her talks on imcw.org if you are interested: http://imcw.org/Talks/Audio-Browser?S=Tara%20Brach
As for me, I drive up and down 95 a lot and have taken to calling the truck company when I see dangerous driving like you experienced. They just want to know the location and license plate and a description of what happened. I feel better not as a venting thing but as if that driver just did this s/he's likely risking other people's lives as well. I've seen some frightening stuff; truckers aren't all the great drivers they used to be.
Stay safe out there!