For each different type of tractor, the Directive lays down the maximum emission level on the basis of the engine power and provides for the gradual, phased reduction of emissions. On 31 December 2010, Stage III A ended, and on 1 January 2011 Stage III B began, which is to run until 31 December 2013.
Op 31 december 2010 eindigde fase III A en per 1.1.2011 is fase III B ingegaan, die op 31 december 2013 zal aflopen.