The mission of Colorado’s Energy Smart Transportation Initiative was to develop a framework for considering energy efficiency and greenhouse gas (GHG) emissions in transportation decision-making. With SSTI assistance, a collaborative team composed of federal and state agencies, MPOs, and rural planning partners came together to leverage resources and promote efficiency and effectiveness among agencies by exploring ways to develop “energy smart transportation” strategies. This report includes strategies developed to incorporate energy efficiency and GHG emissions in transportation planning, increase energy efficiency and reduce GHG emissions from transportation, advance environmentally friendly alternative vehicle and fuel technologies, and increase efficiency through truck fleet enhancements, improved traveler information, and other methods.