The 4k model includes a series of model improvements intended to advance the capabilities of the model for transportation analysis. These improvements include expansion of the zone system, roadway networks from a geodatabase and transit networks from the region’s GTFS inputs. The model was built from the previous 1C model that was used by PSRC for the 2010 Transportation 2040 Plan Update.
This model version also includes updates to trip generation, mode choice and trip distribution from the 2006 Puget Sound Household Travel Survey as well as the 2010 Census. The base year model was updated to 2010 and currently generates forecasts for 2010, 2025 and 2040.