Wilbur Smith Associates for the National Cooperative Highway Research Program, Project 8-36-67, August 2007 

The National Cooperative Highway Research Program commissioned a study of best practices for statewide transportation planning, and it also examined the economic tools used for statewide planning. In reviewing the use of economic impact models, it found two tools to be useful...

"Some states organize performance measures into an economic impact methodology in which all performance measures are monetized over different funding periods. This supports cost/benefit analysis as a way of comparing options. The monetization of potential impacts can also support an overall assessment of statewide impact to earnings, output and employment by industry for the entire state expected to result from different transportation investment levels. Tools such as REMI Transight and TREDIS attempt to convert transportation impacts into different revenue-neutral economic impact projections."