Taking the heavy goods vehicle stock in Germany as an example, one can illustrate important changes between 2007 and 201389. In this period the stock of EURO III heavy goods vehicles dropped from more than 220,000 to just above 5,000 vehicles in 2013. Contrarily to that, EURO V vehicles grew from approx. 19,000 to more than 190,000 vehicles in the same period. As of 1 January 2014, the stock of EURO VI vehicles amounted to only 10,000 vehicles, due to the reluctance of road hauliers to invest in EURO VI trucks given the uncertainties regarding the development of the German toll. Nevertheless, one can expect a similar development of the stock of EURO VI vehicles in the coming years.