Travel Demand

Regulation Layer Software Integration

Deshpande, Akash R.
1999

The project reuses the sensor and actuator interface software developed by California PATH for the DEN1097 automated highway system demonstration on Highway I17 in San Diego during August 1997. This software is provided on the QNX operating system. It interfaces with the magnetometers, radars, and the various intenal sensors such as wheel speed, engine speed, steering angle, etc, as well as with the actuators such as throttle, brake, and steering. In this project, we wrote an interface process that communicates between the driver process described above and the controller process described...

Development of A Path Flow Estimator for Inferring Steady-State and Time-Dependent Origin-Destination Trip Matrices

Zhang, Michael
Nie, Yu
Shen, Wei
Lee, Ming S.
Jansuwan, Sarawut
Chootinan, Piya
Pravinvongvuth, Surachet
Chen, Anthony
Recker, Will W.
2008

Reliable origin/destination (O-D) data are critical to many applications in transportation planning, design and operations. Because of the high costs of and challenges in obtaining reliable O-D trip matrices from surveys or other direct sampling methods, estimating O-D trip tables from a readily available data source, traffic counts, provides an attractive, economical alternative. This project investigates one such an estimation method and implements it in a user-friendly software tool called Visual PFE TD. The developed O-D estimation tool can be used to obtain both static and dynamic O-D...

Improving Mobility through Enhanced Transit Services: Transit Taxi Service for Areas with Low Passenger Demand Density

Li, Yuwei
Miller, Mark
Cassidy, Michael
2009

This research report is the final deliverable for PATH Task Order 6408: “Improving Mobility through Enhanced Transit Services”. The purpose of this task order is to explore alternative methods of providing transit service to areas with low passenger demand density. This report first presents analytical models for determining optimal headway and line spacing for fixed-route, fixed schedule buses, either with fixed stops or allowing buses to stop anywhere along the route. Next, transit taxi services with either fixed or flexible routes that specifically target focused demand patterns are...

Public Transit Use in the United States in the Era of COVID-19: Transit Riders’ Travel Behavior in the COVID-19 Impact and Recovery Period

Parker, M
Li
Bouzaghrane, M
Obeid, H
Hayes, D
Frick, K
Rodriguez, D
Sengupta, R
Walker, J
Chatman, D
2021
COVID-19 has upended travel across the world, disrupting commute patterns, mode choices, and public transit systems. In the United States, changes to transit service and reductions in passenger volume due to COVID-19 are lasting longer than originally anticipated. In this paper we examine the impacts of the COVID-19 pandemic on individual travel behavior across the United States. We analyze mobility data from...

The Effect of Population Mobility on COVID-19 Incidence in 314 Latin American Cities: A Longitudinal Ecological Study with Mobile Phone Location Data

Kephart, J
Delclòs-Alió, X
Rodriguez, D
Sarmiento, O
Barrientos-Gutierrez, T
Ramirez-Zea, M
Quistberg, D
Bilal, U
Roux, AV Diez
2021
Little is known about the effect of changes in mobility at the subcity level on subsequent COVID-19 incidence, which is particularly relevant in Latin America, where substantial barriers prevent COVID-19 vaccine access and non-pharmaceutical interventions are essential to mitigation efforts. We aimed to examine the longitudinal associations between population mobility and COVID-19 incidence at the subcity level across a large number of Latin American cities.In this longitudinal ecological study, we compiled aggregated mobile phone location data, daily confirmed...

Data Sharing of Traveler Information with the Public and Private Sectors: State of the Practice

Miller, Mark A.
Balke, Kevin
2001

This report presents the results of its examination of the current state of the practice of traveler information data sharing with the public and private sectors. A review of the literature was initially performed followed by an analysis of responses to a survey instrument that was designed and administered to practitioners in the field, primarily representatives from public sector agencies, who are in the business of collecting traveler information data. Survey results have addressed the subjects of what data is shared, with whom it is shared, why it is shared, how it is institutionally...

VII California: Development and Deployment Proof of Concept and Group-Enabled Mobility and Safety (GEMS)

Misener, Jim
Sengupta, Raja
Ahern, Katherine
Gupta, Somak Datta
Dickey, Susan
Kuhn, Tom
Lian, Thang
Manasseh, Christian
Nelson, David
Rezai, Shahram
Sharafsaleh, Ashkan
Shladover, Steven
VanderWerf, Joel
2010

This PATH Research Report covers the (Vehicle-Infrastructure Integration) VII California Development and Deployment (Task Order6217) efforts beginning in 2008 and concluding June 30, 2009. This is a successor to the report for TO 5217and reports theapplications-oriented research subsequent to that work.The report is organized by a synopsis of the background and reasons for the VII California project, then it summarizes some of the antecedent (TO 5217) work: the "Innovative Mobility Showcase" (2005), which established the architecture and, importantly the applications (curve overspeed...

Travinfor Evaluation: Value Added Reseller (var) Study Phase 1 Results

Loukakos, D.
Hall, R.
Weissenberger, S.
Yim, Y. B.
1996

TravInfo is a Field Operational Test (FOT) in advanced traveler information systems (ATIS) for the San Francisco Bay Area sponsored by the Federal Highway Administration (FHWA). The project involves a public/private partnership which seeks to compile, integrate and broadly disseminate timely and accurate multi-modal traveler information through commercial products and services. This working paper is part of the Technology Element of the TravInfo evaluation. It presents the results of the "before" wave of the Value-Added-Reseller (VAR) study, in which 17 TravInfo registered VARs and 16 non-...

TravInfo Evaluation (Technology Element) Traveler Information Center (TIC) Study: Operator Response Time Analysis

Miller, Mark A.
Loukakos, Dimitri
2000

TravInfo (TM) is an advanced traveler information system for the San Francisco Bay Area that began operation in September 1996 under a public/private partnership. The public sector component centers on the Traveler Information Center (TIC), TravInfo (TM)'s information gathering, processing, and dissemination hub. For two years, until September 1998, TravInfo (TM) was a Field Operational Test (FOT) sponsored by the Federal Highway Administration. During the FOT, the TIC was evaluated. This report documents the analysis of operator response time. Response times remained stable throughout the...

Whence Induced Demand: How Access Affects Activity

Levinson, David
Kanchi, Seshasai
2000

Additional highway capacity, by increasing travel speed, affects the individual share of time within a 24-hour budget allocated to various activities (time spent at and traveling to home, shop, work and other), some activities will be undertaken more, others less. This paper extends previous research that identified and quantified induced demand in terms of vehicle miles traveled, by considering questions of what type of demand is induced and which activities are consequently reduced. This paper uses the 1990 and 1995 Nationwide Personal Transportation Survey and Federal Highway...