I have a huge respect for long distance truck drivers after a long drive. I just finished a 7 hour drive up California and not sure if I could have gone much longer without stopping to rest. The countless semi trucks I passed on the road I know have been driving much longer than I probably ever will.
Though the laws for truck drivers are confusing, there are limits up to 15 hours of driving. Its hard to imagine driving that long, resting for a certain time outlined in the laws, then getting back on the road all over again.
Be nice to those truckers, they will most likely appreciate the break from all the road rage and won't release the trunk monkey on you.