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Quantifying the Net Social Benefits of Vehicle Trip Reductions: Guidance for Customizing the TRIMMS© Model

This study details the development of a series of enhancements to the Trip Reduction Impacts of Mobility Management Strategies (TRIMMS) model. TRIMMS© allows quantifying the net social benefits of a wide range of transportation demand management (TDM) initiatives in terms of emission reductions, accident reductions, congestion reductions, excess fuel consumption and adverse global climate change impacts. The model also includes a sensitivity analysis module that provides program cost‐effectiveness assessment. This feature allows conducting TDM evaluation to meet the Federal Highway Administration Congestion and Air Quality (CMAQ) Improvement Program requirements for program effectiveness assessment and benchmarking. This document provides guidance to help TDM professionals to use the model by selecting the appropriate cost parameters, providing referenced sources where such parameters can be obtained, and by offering general guidance on how to incorporate data already at their disposal.

Download the final report in pdf format or the final report and TRIMMS 2.0 spreadsheet model  as a zip file.  Note the model is saved in Microsoft 2007 format. If you have Microsoft 2003, you may need to download and install Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats

For more information, contact Sisinnio Concas at



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