Many studies have examined the impact that the built environment has on physical activity, and much of the existing research posits that if communities will provide and improve active infrastructure such as trails, sidewalks, and bike lanes, people will become more physically active. However,...

One of the major foci in transport research is to identify the temporal-spatial decision making structure embedded in activity scheduling and its linkage to actual activity execution. The latter part of the question hasn’t been able to be explored explicitly in real life situation due to...

The concern about air pollution has led government agencies to design and implement mandates to replace some commercial fleets’ gasoline vehicles with Alternative Fuel Vehicles (AFVs). In Part One of this dissertation, I investigate the diffusion of AFV’s in the commercial sector....

This paper investigates factors affecting ITS implementation as a “mainstream†transportation planning activity. It draws upon interviews with 51 leaders from a cross-section of jurisdictions and agencies in California. The interviews revealed that the vast majority of elected...

Over the course of this century, public transit systems in the U.S. have lost most of the market share of metropolitan travel to private vehicles. The two principal markets that remain for public transit systems are downtown commuters and transit dependents – people who are too young, too...

We examine the impact of relationships between contractors and subcontractors on firm pricing and entry decisions in the California highway procurement market using data from auctions conducted by the California Department of Transportation. Relationships in this market are valuable if they...

Most local governments’ off-street parking requirements promote quantity over quality, focusing on ensuring an ample supply of parking. This has undesirable consequences for the built environment. Parking lots and parking structures routinely overwhelm the architecture and urban design of...

Interstate highways have had broad social effects on the United States. The Interstates have not only altered how the nation travels, and how much, but also have changed the structure of communities and regions and the choices that residents are able to make on where to live, work, shop, and...

Transit oriented development is shown to produce an appreciable ridership bonus in California. This is partly due to residential self-selection – i.e., a life-style preference for transit-oriented living – as well as factors like employer-based policies that reduce free parking and...

With the advent of ubiquitous mobile sensing and self-tracking groups, travel demand researchers have a unique opportunity to combine these two developments to improve the state of the art of travel diary collection. While the use of mobile phones and the inference of travel diaries from GPS and...