Emissions Analysis Techniques for TCMs
Overview - A methodology was developed for the U.S. DOT and EPA to analyze the air quality impacts of actions to address freight transportation problems. The methodology provides for a range of analysis procedures, from sketch planning to detailed analysis, depending upon available resource and accuracy needs. The methodology is aimed at strategies within a metropolitan area that affect movements of intercity freight (e.g., intermodal terminals).
Strategies Addressed - Freight/intermodal.
Methodology - A series of analysis steps are outlined, including 1) assess overall freight contributions to regional air quality; 2) develop a profile of the freight system; 3) identify freight strategy options; 4) identify and characterize potential impacts of strategies; and 5) assess impacts. Options for impact assessment include 1) judgment; 2) sketch planning using secondary data; 3) adaptation of existing models; and 4) local case studies, data collection, and model development. The steps are outlined in worksheet form with examples provided. Information to help characterize strategy impacts is also provided.
Data Requirements - Data requirements vary but may include, at a minimum, descriptive data on the local freight system (e.g., ton-miles by mode or terminal) and the strategies to be analyzed, as well as anticipated effects on freight movement. Some data, such as projected truck and rail emission factors, are provided in the report.
Outputs - Changes in modal activity, VMT by mode, emissions.
Level of Effort - A significant level of effort would be required to develop baseline data and strategy assumptions.
Advantages - The freight air quality analysis methodology provides a good framework for analyzing freight projects. The framework is geared toward helping to understand the range of potential impacts of a transportation improvement affecting freight movement. The report also includes some useful data and sample calculations.
Limitations - The options for assessing impacts of specific strategies are not described in detail. The assessment of the impacts of strategies will generally require additional analysis and assumptions by the user.
Source/Availability - Cambridge Systematics, Inc., with Jack Faucett Associates, Inc. and Sierra Research. Air Quality Issues in Intercity Freight: Final Report. Prepared for Federal Railroad Administration, FHWA, and EPA (March 1997). The report is available through the TMIP web site, http://www.fhwa.dot.gov/planning/tmip/.