Modeling & Analytics

4-step modeling

RSG is a nationally recognized expert in the application of 4-step models to produce realistic, defensible forecasts of traffic, ridership, trucks and bicycles that guide critical long-range infrastructure investments and planning efforts. We take pride in calibrating and validating travel models along multiple dimensions well beyond a basic comparison to daily traffic counts. Our models produce realistic speeds, trip lengths, path choices and trip distribution patterns, along with realistic volumes.

Since our founding, we have been devoted to advancing forecasting models and we continue to develop and improve 4-step modeling methods. We have enhanced 4-step models to consider pricing, freight, non-motorized, transit, and demand and system management strategies. RSG has also pioneered the use of genetic algorithms to improve the final validation of the 4-step modeling process. We apply TransCAD, CUBE, EMME and VISUM extensively to implement 4-step models for agencies throughout the United States.

Decision-makers at all levels rely on us to develop and apply accurate, insightful transportation models to understand transportation and land-use interactions and to identify transportation supply-and-demand alternatives. For one state DOT, we are currently developing a standard statewide framework that can be shared by all MPOs within the state.

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