Exterior lighting is used by car manufacturers as a way of differentiating their brands and models. Daytime running lights (DRL), which was made mandatory for all new vehicles in Europe in 2011, is a good example of this trend. More and more new designs and shapes determine the styling of the DRLs which typically use LEDs.
A vehicle using LEDs instead of traditional bulbs for all lights and turn signals could achieve a saving of as much as 2.8 gr. of CO2 per km.