The Royal College of Art recently revealed a rousing rally of auto designs that match sleek profiles with cutting-edge concepts in sustainability. From efficient electric engines to ultra-lightweight materials and driver-less navigation systems, the RCA’s 2008 crop of concept cars struck us as nothing short of stunning.

These concept cars build upon the RCA’s world-renowned vehicle design program, which has produced many exceptional designers over its 40 years of existence. Now that nearly every major auto manufacturer has announced plans for an energy-efficient automobile, we find it truly exciting to chart the territory that future forays in automobile design may take.

Pierre Sabas’ Airflow concept encases an electric engine and suspension within an exterior constructed entirely of glass, while Jon Radbrink’s Nuaero car integrates sophisticated aerodynamic principles such as airfoils, a venturi tunnel, and a catamaran-esque underbody to maximize its efficiency.

Sergio Loureiro Da Silva’s rocket-red Phoenix car pairs beautiful aerodynamic curves with a system that regenerates lost energy through movement, and Arturo Peralta Nogueras’ futuristic vehicle runs on algae http://en.wikipedia.org/wiki/Algae and features an evolving solid hologram technology to adapt to its environment, passengers, and scenarios.