All Cars, All the Time

Renault Altica Concept

This car has some interesting technologies. I'm not so sure about the mosiac rear windows, though.
Check out the rear quarter windows, they are actually a mosaic of transparent panes. The headlights feature four different modes – daytime running lights (DRL), sidelights, low beam and high beam and function using rows of diodes. They also produce a halo effect when the DRL mode is selected. This is achieved in two ways. First of all, each polycarbonate headlight module cover is speckled with thousands of small, micro-engraved nicks. Invisible to the naked eye, these nicks have no effect on the beams and permit light to pass unhindered. In the daytime running mode, however, the surface of the module cover is illuminated from the edge. The light is accordingly trapped inside the mass and spreads out like a fluid over the entire surface to produce an original and effective halo effect for the DRL and sidelight functions.

On the roof, a discreet mechanical system generates jets of air which are alternately blown and sucked through a 2mm wide slit. Known as "Synthetic Jet", the system actively controls the separation of the air flow according to the vehicle's speed. This innovative technique, which reduces drag and controls the structure of the air flow, is a registered Renault patent and reduces the car's Cd at 80mph by 15 percent.