A drive axle is connected to the engine via the differential and gearbox and provides acceleration either forwards or backwards, depending on the gear selected. Lorries are either articulated or rigid. In an articulated lorry, the cab or tractor at…

This calculator works out how much carbon dioxide is released when you burn a certain amount of fuel. The figures are averages as the weights of diesel and petrol depend on a number of factors such as the temperature and…

When a large lorry pulling a heavy load gets a green light it seems like they have changed three or four gears before they are even through the junction. But not all lorries are like this. A smaller rigid lorry…