Travel Time Estimation for Pedestrian with GPS Cell Phones as Probes

Real-Time Urban Traffic State Estimation with A-GPS Mobile Phones as Probes

This paper presents a microscopic traffic simulation-based method for urban traffic state estimation using Assisted Global Positioning System (A-GPS) mobile phones. In this approach, real-time location data are collected by A-GPS mobile phones to track vehicles traveling on urban roads. In addition, tracking data obtained from individual mobile probes are aggregated to provide estimations of av...

Real-Time Estimation of Urban Street Segment Travel Time Using Buses as Speed Probes

AVL encompasses a variety of location and communication technologies. Archived AVL (or on-vehicle data recording) uses an onboard computer to record and store bus operation data and upload them to a data tank at a specific time (usually daily); real-time AVL (or offvehicle data recording) sends bus travel and operation data to a central computer in real time (usually at a frequency of 30 s to 5...

Developing travel time estimation methods using sparse GPS data

Signal Progression Impacts on Transit Buses as Travel Time Probes

With the deployment Automatic Vehicle Location systems to monitor transit vehicles (and other fleet vehicles), there have been several efforts in recent years that seek to leverage these data to also obtain arterial travel times for the private vehicle population. The fleet vehicle data capture the traffic conditions, but they also capture behavior unique to the fleet, e.g., servicing passenger...

Using GPS-enabled cell phones to track the travel patterns of adolescents

BACKGROUND Few tools exist to directly measure the microsocial and physical environments of adolescents in circumstances where participatory observation is not practical or ethical. Yet measuring these environments is important as they are significantly associated with adolescent health-risk. For example, health-related behaviors such as cigarette smoking often occur in specific places where sm...