Dynamic LED signs help drivers negotiate Beijing traffic. Maintaining vehicles at a steady speed improves air quality because engines operate more effectively. Energy and Environment Policies that promote energy efficiency improve local economies while preserving the environment. We advise governments, utilities and advocates on how to incorporate LEDs in smart ways. LEDs can provide great cost and maintenance savings. Single color LEDs require far less electricity to operate than conventional light sources do. LEDs are durable and have sophisticated control options. Emerging applications for dynamic LEDs include retail lighting, replacement of neon and fluorescent signage, and traffic guidance systems. Safety and Savings All around the world transportation authorities are replacing inefficient incandescent lamps in traffic and pedestrian signals with LEDs. By installing LED exit signs, building managers reap savings and can rely on long-term, no-maintenance operation. These two LED applications are recognized for their value by the US EPA/DOE Energy Star programs.