Be patient when waiting to overtake a truck. It takes several seconds longer to pass a truck on a level road than it does to pass a car, so it's more important than usual to make sure there's plenty of clear road ahead so you can safely complete the overtaking manoeuvre.
Don't be annoyed if the truck is keeping close to the centre line. The truck driver isn't doing this to stop you from passing – they're probably trying to avoid overhanging trees or the broken, uneven edges of the road.
Don't come too close to the back of the truck before you move out to overtake. As well as limiting your visibility and the truck driver's ability to see your vehicle, you may not get an accurate impression of the strength of the head wind. Also, you'll be driving in an area of low pressure that 'sucks' your vehicle along, making it seem as though it has more engine power available than it actually does.
It's important to give yourself enough room to build up speed – but remember to keep your speed to a level that is safe for the conditions. You also need to give yourself enough room to return to your lane if there's an oncoming hazard.
Make sure you indicate, so the truck driver knows you intend to pass. As you pass the truck, be aware that air turbulence could affect your vehicle's behaviour. Motorcycles and small cars are particularly affected by the air turbulence around large vehicles.
Unless it's an emergency, don't return to your lane until the whole of the front of the truck is visible in your rear-view mirror. Trucks can have blind spots extending several metres in front of them, so truck drivers may not be able to see your vehicle if you cut in too close. Maintain your speed so the truck isn't forced to brake abruptly.
When passing a stationary truck, lower your speed in case the truck driver steps onto the road.