Because of the difficulty often encountered in deciding whether a patient's symptoms originate in the upper or lower gastrointestinal tract, gastrointestinal transit scintigraphy is a uniquely suited noninvasive, quantitative, and physiologic method of determining whether there is a motility disorder affecting the stomach, small bowel, or colon. Small-bowel and colon transit studies can be perf...

This report presents the development of Geographically Weighted Regression (GWR) models for predicting public transit use for home-based work trip purpose. A large array of potential transit use predictors were considered, including demographic, socioeconomic, land use, transit supply quality, and pedestrian environment variables. The best predictors identified through model estimation include ...

Public transport systems have to balance financial sustainability with a need to provide affordable services, in particular to lower-income populations. In reality, meeting both goals is difficult, with transport systems either relying on high levels of subsidies or charging transit fares that are too expensive for the city’s poor. This note describes the opportunities associated with the use o...

Users of mass transit systems such as those of buses and trains normally rely on accurate route maps, stop locations, and service schedules when traveling. If the route map, service schedule, or stop location has errors it can reduce the transit agency’s ridership. In this paper, the problem of deriving transit systems by mining raw GPS data is studied. Specifically, we propose and evaluate nov...

Transportation modes, including Walking and other private modes as well as transit services, provide travel options to the individual trip-maker along a transportation network. On a single basis, any modal option is featured here in terms of travel time to destination conditionally to immediate availability, expected wait time in the adverse case and the probability of availability. The paper i...

The potential of smart-card data for measuring the variability of urban public transit network use is the focus of this paper. Data collected during 277 consecutive days of travel on a Canadian transit network are processed for this purpose. The organization of data using an object-oriented approach is discussed. Then, measures of spatial and temporal variability of transit use for various type...

This chapter deals with an important citizen right: the ability to walk from home or work to the transit stop, or wait at a bus stop or on a station platform without the fear of being victimized. Crime and fear of crime unfortunately affect many aspects of everyday life in our cities. Transit crime is a rather persistent but underreported trend that scares and intimidates riders – particularly ...

Recently, many cities have launched new rail transit lines. Once these new rail transit lines start commercial operation, they will play important roles as competitors to conventional bus services. In this paper, the effects of nationalization on equilibria have been studied in a mixed duopoly public transport market, in which one publicly-owned rail transit operator competes with one private b...