The EVA model developed by Lohse at Dresden Technical University constitutes an alternative approach to the first three stages of the classical traffic planning model (Lohse 1997). The model differs from the above-described Standard 4-step model (Standard 4-step model in two variants) by the following features.
- If trip generation and trip distribution are calculated independently, i.e. one after the other and above all separately for each activity pair as in the Standard 4-step model, it often happens that differences occur between the origin and destination traffic of the zones. The EVA model links generation and distribution by an explicit constraints step to make up for the differences.
- In the EVA model trip distribution and mode choice are performed simultaneously, i.e. by applying a one-stage discrete choice model to three-dimensional utility matrices indexed according to origin zone, destination zone and mode.
