State and Local Transportation Resources
Transportation-Related Documents
Policy & Guidance
- Main Policy & Guidance Page
- Guidance on Innovative and Voluntary Air Pollution Control Strategies
- Transportation-Related Documents
- Stationary Source-Related Documents
NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
Topic-specific guidance documents that 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.
- Accelerated Retirement of Vehicles
- Airports
- Commuter Programs
- Fuels
- 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
Accelerated Retirement of Vehicles
- Guidance for the Implementation of Accelerated Retirement of Vehicles Programs (PDF) (29 pp, 69K, EPA420-R-93-018, February 1993)
Guidance that illustrates a methodology for calculating benefits and an administrative framework targeting vehicles that have been identified as high emitters.
Airports
- Guidance on Airport Emissions and Emission Reductions
These documents and links provide guidance for establishing strategies to reduce airport emissions, including emissions from airport ground support equipment (GSE) and ground access vehicles. These documents were developed for regional, state, and local agencies, airports, airlines, and other organizations that want to reduce airport pollution.- Guidance on Airport Emission Reductions Credits for Early Measures through Voluntary Airport Low Emission Programs (PDF) (45 pp, 312K)
Joint guidance issued by EPA and the Federal Aviation Administration (FAA) outlining the process for crediting voluntary airport emission reductions in a State Implementation Plan (SIP). - Emissions and Dispersion Modeling System (EDMS)
An FAA air quality assessment tool designed to assess the air quality impacts of airport emission sources, including aircraft, GSE, ground access vehicles, and other sources. - Technical Support for the Development of Airport Ground Support Equipment Reductions (PDF) (144 pp, 734K, EPA420-R-99-007, May 1999)
A study that discusses program design and the potential for achieving emission reductions from GSE. - Airport GSE Model (XLS, 492K)
A spreadsheet tool that provides users with a quick analysis of the emission benefits and cost-effectiveness of controlling GSE emissions. - Airport GSE Model Directions (PDF) (17 pp, 107K)
Directions for operating the Airport GSE Model.
- Guidance on Airport Emission Reductions Credits for Early Measures through Voluntary Airport Low Emission Programs (PDF) (45 pp, 312K)
Commuter Programs
- Guidance on Emissions and Emission Reductions from Commuter Programs
The documents and links below provide guidance for crediting emission reductions from commuter programs, such as EPA's Best Workplaces for Commuters, when the program successfully reduces pollution from vehicle sources.- Guidance for Quantifying and Using Emission Reductions from Best Workplaces for Commuter Programs in State Implementation Plans and Transportation Conformity Determinations (48 pp, 2M, EPA-420-B-07-015, October 2007)
Guidance describing how to credit commuter benefit programs, such as EPA's Best Workplaces for Commuters program, in a SIP or transportation conformity determination. - Fact Sheet on Guidance for Quantifying and Using Emission Reductions from Best Workplaces for Commuters programs in State Implementation Plans and Transportation Conformity Determinations | PDF version (3 pp, 100K, EPA-420-F-07-064, October 2007)
Summary of EPA guidance for state and local agencies that want to credit emission reductions resulting from changes in commuter trip behavior to their SIPs and transportation conformity determinations. - COMMUTER Model (ZIP XLS, 13M)
An EPA assessment tool that provides estimates on how commuter benefits can impact nitrogen oxide, particulate matter and air toxic emissions, and fuel use and costs. - Commuter Model v2.0 Coefficients (PDF) (13 pp, 295K, EPA420-B-05-019, October 2005)
An explanation and listing of mode-choice coefficients used in the COMMUTER model. - Commuter Model v2.0 User Manual (PDF) (63pp, 1.8M, EPA420-B-05-017, October 2005)
Manual for the COMMUTER model. - Procedures Manual for the Commuter Model v2.0 (PDF) (99 pp, 1M, EPA420-B-05-018, October 2005)
Procedures for operating the COMMUTER model.
- Guidance for Quantifying and Using Emission Reductions from Best Workplaces for Commuter Programs in State Implementation Plans and Transportation Conformity Determinations (48 pp, 2M, EPA-420-B-07-015, October 2007)
Fuels
- Guidance on Quantifying NOx Benefits for Cetane Improvement Programs for Use in SIPs and Transportation Conformity (PDF) (32 pp, 253K, EPA420-B-04-005, June 2004)
Guidance that outlines EPA's policy for giving SIP credit for emission reductions attributable to the use of cetane additives in diesel fuel.
Idling
- Locomotive Idling Guidance (PDF) (24 pp, 312K, EPA-420-B-09-037, October 2009)
Guidance for quantifying and using long duration switch yard locomotive idling emission control programs in State Implementation Plans and transportation conformity. - Truck Idling Guidance (PDF) (33 pp, 378K, EPA420-B-04-001, January 2004)
Guidance for quantifying and using long duration truck idling emission control programs in State Implementation Plans and transportation conformity.
Intelligent Transportation Systems Management
- Assessing the Emissions and Fuel Consumption Impacts of Intelligent Transportation Systems (ITS) (PDF) (70 pp, 506K, EPA 231-R-98-007, December 1998)
This study describes the types of modeling approaches needed to capture the short- and long-term transportation, emissions, and fuel consumption impacts of ITS deployment.
Land Use
- Background Information for Land Use SIP Policy (PDF) (66 pp, 736K, EPA420-R-98-012, September 1998)
This report summarizes efforts by states to take SIP credit for land use strategies and areas where additional policies are needed to support effective land use SIP policies. - Comparing Methodologies to Assess Transportation and Air Quality Impacts of Brownfields and Infill Development (PDF) (49 pp, 1.4M, EPA-231-R-01-001, August 2001)
This report describes and compares four methods for characterizing the air quality benefits resulting from infill development. This report is a companion piece to EPA's policy guidance entitled, "Improving Air Quality Through Land Use Activities." - Evaluation of Modeling Tools for Assessing Land Use Policies and Strategies (PDF) (60 pp, 244K, EPA420-R-97-007, August 1997)
This EPA-sponsored report addresses the relationship between land use, mobility, and vehicle miles traveled; provides an assessment of various travel demand and land use modeling tools. - Granting Air Quality Credit for Land Use Measures: Policy Options (PDF) (56 pp, 180K, EPA420-P-99-028, September 1999)
This study analyzes policy options for recognizing and providing credit for sustainable land use activities when specific control measures are employed. - Improving Air Quality Through Land Use Activities (PDF) (110 pp, 1.8M, EPA420-R-01-001, January 2001)
Guidance to assist air quality and transportation planners in accounting for the air quality impacts of voluntary land use policies and projects.
Retrofits
- Guidance for Mobile Emission Credit Generation by Urban Buses
Guidance documents that outline federal policies supporting urban bus retrofit/clean fuel use in large metropolitan areas. - Diesel Retrofits: Quantifying and Using Their Benefits in SIPs and Conformity - Guidance for State and Local Air and Transportation Agencies
Guidance document and fact sheet for quantifying and using emission reductions from retrofitted diesel vehicles, engines, and equipment. This guidance applies to both highway vehicles (such as buses and trucks) and nonroad vehicles, engines, and equipment (such as construction equipment). - SmartWay SIP and Conformity Guidance (PDF) (35 pp, 306K, EPA420-B-07-004, June 2007)
This document describes how to quantify and use reductions in nitrogen oxides (NOx) that result when trucks are outfitted with two specific SmartWay fuel-efficient technologies: trailer aerodynamic kits and low-rolling resistant tires.- Fact Sheet | PDF Version (3 pp, 106K, EPA420-F-07-045, June 2007)
Contact: Gary Dolce, phone: 734-214-4414, email: dolce.gary@epa.gov
Transportation Control Measures
- Analyzing Emission Reductions From Travel Efficiency Strategies: A Guide to The TEAM Approach (PDF) (46 pp, 2M, EPA-420-R-11-025, December2011)
This document provides information and guidance for using the Travel Efficiency Assessment Method (TEAM) approach for assessing the potential of travel efficiency strategies for reducing criteria and greenhouse gas emissions. The guide supports a preliminary evaluation of emission reductions for several travel efficiency strategies and combinations of strategies. TEAM uses regionally derived travel model data and other travel activity information, sketch-planning analysis and EPA’s Motor Vehicle Emissions Simulator (MOVES) to estimate emission reductions.
Contact: Mark Simons, phone: 734-214-4420, email: simons.mark@epa.gov. - Potential Changes in Emissions Due To Improvements In Travel Efficiency (PDF) (84 pp, 2.5M, EPA-420-R-11-003, March 2011)
This report provides information on the effectiveness of travel efficiency measures for reducing criteria and greenhouse gas emissions at the national scale. The report describes an approach that uses regionally derived travel model data and other travel activity information, and sketch-planning analysis to estimate potential emission reductions from urban areas of varying size and characteristics. The results are applied to other urban areas in the U.S. of similar characteristic to estimate national emission reductions.- Potential Changes in Emissions Due To Improvements in Travel Efficiency - Supplemental Report: Analysis of Potential Co-Benefits (PDF) (21pp, 1.7M, EPA-420-R-11-014 November 2011)
In this supplemental report, several co-benefits resulting from the implementation of the travel efficiency strategies or combinations of strategies (referred to as scenarios) analyzed in the March 2011 primary report are evaluated. The co-benefits from implementation of these scenarios include a reduction in health impacts associated with air pollution, reduced traffic congestion, reduced user operating costs, improved energy security, and reduction in traffic accidents.
Contact: Mark Simons, phone: 734-214-4420, email: simons.mark@epa.gov.
- Potential Changes in Emissions Due To Improvements in Travel Efficiency - Supplemental Report: Analysis of Potential Co-Benefits (PDF) (21pp, 1.7M, EPA-420-R-11-014 November 2011)
- Transportation Control Measures: An Information Document for Developing and Implementing Emission Reduction Programs (PDF) (42 pp, 6.6M, EPA-430-R-09-040, March 2011)
This document provides information on transportation control measures that have been implemented across the country for a variety of purposes, including reducing criteria pollutants and greenhouse gases. The document describes the processes used to develop and implement the strategies and, where available, their effectiveness.
Contact: Mark Simons, phone: 734-214-4420, email: simons.mark@epa.gov - Benefits Estimates for Selected Transportation Control Measure (TCM) Programs (PDF) (95 pp, 677K, EPA420-R-98-002, March 1999)
This report quantifies TCMs that have been implemented, and outlines the methodologies used for estimating their emission and travel activity effects. - Methodologies for Estimating Emission and Travel Activity Effects of TCMs (EPA420-R-94-002, July 1994)
This is an overview of several different methodologies available for assessing the potential emission reductions associated with transportation control measures. - Transportation Control Measure: State Implementation Plan Guidance (PDF) (243 pp, 11.2M, EPA 450/2-89-020, September 1998)
This document lists approval criteria that needs to be met so that a transportation control measure (TCM) may be incorporated into a SIP. The guidance also directs states to use additional TCM-specific guidance where available. - Index of Transportation Measure Quantification Efforts: Methodology Matrix (PDF) (156 pp, 1M, September 1998)
This is a list of summaries of a broad range of studies that have been conducted to evaluate the effectiveness of transportation control measures. - Transportation Control Measure Information Documents (EPA400-R-92-006, March 1992)
This report describes variations in implementation, examples, expected transportation and emission impacts, and other important considerations for the 16 broad categories of TCMs as required and described under Section 108(f) of the Clean Air Act. (All of the following are PDF files)- Executive Summary (34 pp, 2.1M)
- Transportation/Air Quality Background Information (43 pp, 2.8M)
- Accelerated Retirement of Vehicles (17 pp, 1M)
- Activity Centers (44 pp, 2.8M)
- Area-Wide Rideshare Incentives (29 pp, 2.2M)
- Bicycle and Pedestrian Programs (22 pp, 1.7M)
- Employer-Based Transportation Management Programs (27 pp, 2.1M)
- Extended Vehicle Idling (9 pp, 471K)
- Extreme Low-Temperature Cold Starts (9 pp, 538K)
- High Occupancy Vehicle Lanes (21 pp, 1.3M)
- Improved Public Transit (35 pp, 2.4M)
- Park-and-Ride/Fringe Parking (22 pp, 1.6M)
- Parking Management (22 pp, 1.6M)
- Special Events (28 pp, 1.9M)
- Traffic Flow Improvements (23 pp, 1.6M)
- Trip Reduction Ordinances (48 pp, 3.6M)
- Vehicle Use Limitations/Restrictions (27 pp, 1.9M)
- Work Schedule Changes (23 pp, 1.7M)
Transportation Pricing
- Opportunities to Improve Air Quality through Transportation Pricing Programs (PDF) (142 pp, 603K)
This document provides general information on pricing programs, including pricing program advantages, the institutional relationships necessary for pricing measures to work, and some pitfalls to avoid in implementing a program. - Technical Methods for Analyzing Pricing Measures to Reduce Transportation Emissions (PDF) (257 pp, 1.8M, EPA 231-R-98-006, August 1998)
This report, jointly funded by EPA and DOT, provides technical assistance on best practice approaches for analyzing various transportation pricing policies.