In life good things are meant to be shared...

...so recently I was really happy to share a short story on TU Delft Transport Institute website about my Marie Curie research project experience. Here is the link…

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New article: Stay local or go regional? Urban form effects on vehicle use at different spatial scales: A theoretical concept and its application to the San Francisco Bay Area

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Abstract: This paper explores the respective roles of local and regional characteristics of urban form on vehicle travel. We hypothesize that the effects of urban form on vehicle use at the local and regional levels are complementary, and we introduce the concept of local and regional action spaces, which are defined based on the accessibility of alternative means of transport within an acceptable travel time, to test this hypothesis. Multilevel and ordered logit models are developed for the San Francisco Bay Area to estimate the effects of urban form and socioeconomic characteristics on vehicle kilometers traveled (VKT) and vehicle trip frequency (for work, shopping, and social/recreational purposes). We find that the two urban scale characteristics exert complementary effects on VKT. However, because people in the San Francisco Bay Area display significantly lower VKT in the local than in the regional action space, we conclude that regional-scale inter-ventions would c…
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New article: Do people consider an acceptable travel time? Evidence from Berkeley, CA

Abstract: This paper explores the extent to which people identify an acceptable travel time for each trip they want to make and investigates the primary characteristics of this behavioural threshold. We assume that an acceptable travel time is defined through utilitarian processes that are related to cognitive and affective evaluations of travel that develop throughout a person’s lifetime. We apply a mixed methods approach to explore our hypothesis, based on semi-structured in-depth interviews with a stratified, according to commuting mode, random sample of 20 individuals living in Berkeley, CA. Our results support the validity of the acceptable travel time concept and offer (a) initial evidence on its variation to the travel mode and sociodemographic characteristics and (b) insights into people’s perceptions, attitudes, feelings and experiences about their travel. Thus, our results can contribute to a better understanding of individuals’ travel decisions and valuation of…
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Our new article on accessibility implications of AVs is featured in Elsevier’s latest key research list on AVs

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Our new article with Maarten Kroesen and Bert Van Wee on accessibility implications of AVs is featured in Elsevier’s latest key research list on AVs and is now offered free to access until September 30, 2018 (available here)!
In this article, we applied Q-method among a sample of 17 international accessibility experts and concluded that changes in accessibility because of automated vehicles are expected to (a) be highly uncertain, (b) induce both densification and further sprawl, (c) be distributed unequally among social groups.
Here is the abstract of the article:
In this paper, possible accessibility impacts of fully automated vehicles (AVs) are explored. A conceptual framework for those impacts is developed based on the model of four accessibility components (i.e. land use, transport, temporal and individual) of Geurs and van Wee (2004). Q-method is applied among a sample of seventeen international accessibility experts to explore heterogeneity among experts with respect to the impa…
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