Back on topic:
Semis: they like to go about 50 up big hills, and 80+ down them. Why? They weight 40 tons (80,000 lbs) and needs every bit of that speed they gain going down hills to get back up the next. DO NOT under ANY circumstances play police and try to slow them down. Not only are you contributing to the quite possibly deadly phenomenon known as brake fade by making them ride the brakes (because trucks gain more speed going down a hill than a car) you are forcing them to slow down even more on the next hill, which will only help to congest traffic. If you are in the right lane, expect to go slow up hill, and then have trucks up your butt down hill. If there is one close behind you, give it gas and get going faster. Police will ticket him over you because it is a much more expensive ticket, but still be on the lookout.
Also, don't linger next to them because if they loose a tire, you are as good as dead. When they loose tires, they swerve across traffic as they fight to regain control of their rig, which often means anybody in adjacent lanes is hit.
