a maximum of is laid in the directive for each type of tractor on the basis of engine performance and af gradual in stipulated in multiple phases
A maximum level of emissions is laid down in the directive for each type of tractor on the basis of engine performance, and a gradual reduction in emissions is stipulated in multiple phases.
A maximum of is laid in the directive for each type of tractor on the basis of engine performance, and a gradual in stipulated in multiple phases.