Once the perfect aesthetic solution, now consigned to the history books.
Pop-up and retractable headlights experienced a burst in popularity in the 1980s and 1990s as a way to give a model a sporty, aerodynamic aesthetic at the front end. Unfortunately, they've disappeared from showrooms today. As a design cue, pop-up lights could probably still be very attractive, but pedestrian safety standards, particularly here in Europe, make them difficult to implement because of the potential for hurting a person in a collision. In addition, efficiency regulations make fuel economy a major concern, and the extending lights affect aerodynamics at night.