Directive 96/53/EC promotes 'greener and safer' trucks by allowing longer trucks in international traffic when they have aerodynamic cabs with improved comfort and safety and when fitted with rear aerodynamic devices (flaps). It is proposed to amend Regulation (EU) No 1230/2012 to allow aerodynamic flaps beyond 50 cm (currently limited) and to provide requirements for type-approval of vehicles with regard to aerodynamic cabs. This will help reducing CO2 emissions and increasing fuel efficiency.