What do you need to consider before overtaking a heavy truck?

Before overtaking a heavy truck, or other large vehicle, you need to keep in mind that:

• Such vehicles often increase their speed going downhill.
• The driver may not be able to keep to the right because of an obstacle – which you cannot see – further down the road.
• The driver may be forced to veer left because of an obstacle – which you cannot see – further down the road.