c description and assumptions of the travel model tier 1 draft peis december 2004 page appendix i 70 system includes models that were created in three software platforms as follows demand transcad consists databases mathematical relationships algorithms which when run a set provide forecasts use corridor beyond to an area defined north by wyoming south pueblo east denver international airport greeley west utah this five days 2000 calibration for current scenario 2025 forecast various project alternatives these can then be extrapolated entire year or from information performance analyses performed each alternative such are summarized chapter 2 b traffic simulation vissim highway networks on including times speeds queuing modeling purposes has been split into two parts western portion glenwood springs