TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2252 contains 19 papers that explore economic and environmental optimization of vehicle fleets, driver response to energy information feedback, California's low-carbon fuel standard, feebates and fuel economy standards, energy use for transport in 27 European Union countries through 2030, and a comparison of diesel and hybrid models in the United States in 2010.

This issue of the TRR also examines plug-in hybrid and battery electric vehicles, lithium ion batteries, natural gas as vehicle fuel, smart materials for energy harvesting from pavements, subscription service for electric vehicles, location of charging stations for electric vehicles, greenhouse gas emissions, climate action plans and long-range transportation plans, mass transit to reduce carbon dioxide emissions in Japan, and inventory of carbon dioxide emissions in Beijing.