Travel Demand Model Documentation
The Kootenai Metropolitan Planning Organization (KMPO) was formed in 2003. The first KMPO traditional four-step travel demand model for the AM Peak Hour and the PM Peak Hour was developed by KMPO staff and PTV of America in 2003.
The typical gravity demand model is called a four-step model and is based upon Trip Generation, Trip Distribution, Mode Choice, and Route Assignment. Mode choice is made up of private cars, public transit such as buses, and/or non-motorized travel. The KMPO model is currently a three-step model, having only one mode choice which is private vehicles. This mode choice feature is planned to be expanded upon in the future adding other mode choices.
The model was updated by HDR, Inc. in 2007, by KMPO staff, with assistance from Eco Resource Management Systems Inc. and PTV of America, in 2010, and by KMPO staff, with the assistance from PTV Group, in 2016 and 2018.
In Spring 2005, the Spokane Regional Transportation Council (SRTC) contracted with NuStats to conduct a Household Travel Characteristics Study, commonly referred to as the household travel survey. The goal of this survey was to create a database containing accurate information on trips, trip characteristics, household characteristics, and person characteristics for a representative sample of households in Spokane and Kootenai Counties. These data will be used to update travel demand forecast models, to identify Transportation Improvement Plan priorities, and to inform other transportation planning and policy needs of the counties. NuStats designed the survey, managed data collection, processed and geocoded the data, provided quality control and assurance, analyzed the survey data, and created the weighting, and expansion factors.