Under the Transportation Equity Act for the 21st Century (TEA-21), part of Montana's Congestion Mitigation and Air Quality (CMAQ) apportionment is dedicated to Missoula and at the direction of the Montana Transportation Commission, the Montana Department of Transportation (MDT) directs the remainder of the CMAQ apportionment to areas in nonattainment status that were previously ineligible for CMAQ funds to proactively address air quality and automobile congestion problems through the Montana Air and Congestion Initiative (MACI) program. The purpose of this project was to assess the cost-effectiveness of projects funded to date through the MACI/CMAQ program.

TRB’s National Cooperative Highway Research Program (NCHRP) Report 716: Travel Demand Forecasting: Parameters and Techniques provides guidelines on travel demand forecasting procedures and their application for helping to solve common transportation problems.