The car stock module calculates the size and composition of the car stock. Its output is a full de‐ scription of the car stock in every year, by vehicle type (fuel), age and (emission) technology of the vehicle. The vehicle stock is represented in the detail needed to compute the transport emissions. For buses, coaches, road freight vehicles, inland navigation and rail the car stock is not mod‐ elled in detail. In these cases the model uses information about the vkm and tkm rather than the vehicle stock to determine resource costs, environmental costs, etc. .
