This U.S. Environmental Protection Agency (EPA) website gathers together a number of guidance documents covering various approaches to reducing emissions and energy use in the transporation sector. The site also gathers and provides guidance in the use of several tools that can be used to estimate the impacts of various approaches to transportation emissions reduction. The topic-specific guidance documents outline EPA policies for crediting programs (e.g., commuter programs, heavy duty retrofit, and fuels) that can help reduce transportation-related air pollution and emissions. Topics covered are:

• Accelerated Retirement of Vehicles
• Airports
• Commuter Programs
• Idling
• Intelligent Transportation Systems Management
• Land Use
• Retrofits
• Transportation Control Measures
• Transportation Pricing
• Guidance on Fulfilling Clean Air Act Section 182(d)(1)(A) Requirements

View the EPA website here: EPA State and Local Transportation Resources.