Uniform provisions concerning the approval of vehicles with regard to the protection of the occupants in the event of a frontal collision Uniform provisions concerning the approval of vehicles with regard to the protection of the occupants in the event of a lateral collision Uniform provisions concerning the approval of compression ignition ( C.I . ) engines to be installed in agricultural and forestry tractors and in non-road mobile machinery with regard to the emissions of pollutants by the engine Uniform provisions concerning the approval of vehicle alarm systems ( VAS ) and of motor vehicles with regard to their alarm systems ( AS )