Mode Choice models are mathematical expressions used to estimate the share of travel on each available mode given the time and cost characteristics of each mode and the demographic and socio-economic characteristics of trip makers. Mode choice models are designed to be an integral link in the travel demand chain with feedback mechanisms to related model components potentially including: auto ownership, trip generation, trip distribution, and (modal) trip assignment. The last set of mode choice models were developed for Austin in the early 1980’s. The City of Austin and the corresponding greater metropolitan area have undergone significant change in the last 20 years, including extensive growth and development. For these reasons, mode choice models were estimated entirely from local data gathered as part of the 1997 Home-Interview and Transit On-Board surveys. The model structure used for the Austin mode choice models is a nested logit mode model, as opposed to a hierarchical or multinomial model.
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July 1, 2000