Stay far enough behind a semi truck that you can see the roadway ahead clearly.
Position your vehicle so you are outside the truck's blind spot, and be sure the truck driver can see you in the rearview mirror. If you cannot see the truck's mirror, the driver cannot see you.
Dim your lights at night. Bright lights reflected in the mirrors can blind the driver.
Stay back in rainy conditions. Spray and splash from the rear wheels can cover your windshield with sheets of water or mud.
Check to your front and rear before moving into the passing lane. Only pass if it is clear and you are in a legal passing zone.
Increase your speed to pass a truck on a downhill grade. Trucks travel faster downhill and slower uphill because of their weight.
Complete your pass as quickly as possible.
Let the driver know he has passed you by blinking your headlights, especially at night. The driver will appreciate knowing he is now safe to move back in front of you.