1.

SLOW DOWN ON TURNS AND CURVES -- at least 5 mph, if not 10 mph, BELOW the posted ADVISORY SPEED.

Now here's the part that messes so many people up:

2.

ALWAYS, ALWAYS, ALWAYS use the SPEEDOMETER to know your speed!!! Check it BEFORE you come into the curve or turn.

Do NOT judge your speed by what it "FEELS" like...you will nearly always be WRONG ...

It is a proven fact that the "human speedometer" is, well, a piece of crap. What happens is this: a person drives for several hours or more down the interstate at 55, 60, 65 mph. They become used to moving at this speed. When it's time to slow down and exit the interstate, unless they look at the speedometer, they will almost always be WRONG about how fast they are actually moving. They may think it "feels" like 35, but will more than likely be going 45 mph or more. It is a natural human tendency and it's said that this gets WORSE as you become more comfortable in the truck. Don't believe it? This one is "safe to try at home" (with your CAR -- but don't get TOO carried away!)