BMW's roadster concept, shown at Geneva, is really more about the electronics than traditional design or motive power. Vision ConnectedDrive integrates three driving modes, which BMW calls Safety, Infotainment, and Environment. Each state uses lighting effects to signal its presence. Orange signifies Safety, and is denoted here by the lighting effects in the hood, which direct the driver's attention to the road.
Photo credit: Wayne Cunningham/CNET