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SUMMARY:You Can Lead Travellers to the Bus Stop\, But You Can’t Make The
 m Ride
DTSTART:20130502T121500
DTEND:20130502T131500
DTSTAMP:20260916T044002Z
UID:9c13aec61682926e71f38c2ec604629c4007ded9b16d3181e9230924
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Joan Walker\nLatent modal preferences\, or modality styl
 es\, are defined as lifestyles built around the use of a particular travel
  mode or set of travel modes. Traditional models of travel mode choice ass
 ume that (1) that all individuals are aware of the full range of travel mo
 des at their disposal and make a rational mode choice based on level-of-se
 rvice and (2) individual modal preferences are characteristics of the indi
 viduals that are exogenous to the choice situation and stable over time. T
 hough these assumptions simplify the model\, they risk overlooking the imp
 act of more deeply entrenched individual variations in modal preferences.\
 nThis talk presents a latent class choice model (LCCM) that allows modal p
 references to be endogenous to the choice situation and variable across in
 dividuals. The model is applied to analyze modality styles and travel mode
  choice behavior of 25\,000 people in the San Francisco Bay Area. The stud
 y identifies six distinct modality styles in the sample population that di
 ffer in terms of their taste parameters and choice sets. Most notably\, ne
 arly a third of the sample is found not to consider any mode other than au
 to. Results show that an individual’s value of time is sensitive to the 
 level-of-service\, and an increase in congestion can induce decision-maker
 s to lower their value of time. Findings further reveal that incremental i
 mprovements in the transportation system result in far smaller changes in 
 travel behavior than predicted by traditional models\; what is needed is a
  dramatic change to the transportation system that forces individuals to r
 econsider their modality styles. This is joint work with UC Berkeley docto
 ral candidate Akshay Vij.\nBio: Joan Walker’s research focus is behavior
 al modeling\, with an expertise in discrete choice analysis and travel beh
 avior. She works to improve the models that are used for transportation pl
 anning\, policy\, and operations. Professor Walker joined UC Berkeley in 2
 008 in the Department of Civil and Environmental Engineering and as a memb
 er of the interdisciplinary Global Metropolitan Studies initiative. She re
 ceived her Bachelor's degree from UC Berkeley and her Master's and PhD deg
 rees from MIT. Prior to joining UC Berkeley\, she was Director of Demand M
 odeling at Caliper Corporation and an Assistant Professor at Boston Univer
 sity. She is Chair of the Transportation Research Board’s Committee on T
 ransportation Demand Forecasting\, an Associate Editor of Transportation S
 cience\, and a recipient of the Presidential Early Career Award for Scient
 ists and Engineers (PECASE).
LOCATION:GC C330
STATUS:CONFIRMED
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