Intelligent Transportation Systems

Simulating the Impact of Dynamic Rerouting on Metropolitan-scale Traffic Systems

Chan, Cy
Kuncheria, Anu
Jane Macfarlane
2023

The rapid introduction of mobile navigation aides that use real-time road network information to suggest alternate routes to drivers is making it more difficult for researchers and government transportation agencies to understand and predict the dynamics of congested transportation systems. Computer simulation is a key capability for these organizations to analyze hypothetical scenarios; however, the complexity of transportation systems makes it challenging for them to simulate very large geographical regions, such as multi-city metropolitan areas. In this article, we describe enhancements...

Differentially Private Map Matching for Mobility Trajectories

Haydari, Ammar
Chuah, Chen-Nee
Zhang, Michael
Jane Macfarlane
Peisert, Sean
2022

Human mobility trajectories provide valuable information for developing mobility applications, as they contain diverse and rich information about the users. User mobility data is valuable for various applications such as intelligent transportation systems (ITS), commercial business models, and disease-spread models. However, such spatio-temporal traces may pose a threat to user privacy. GPS trajectories in their raw form are not suitable for transportation studies, as they require matching locations with nearest road links — a process called map-matching. This paper presents a differential...

Mobiliti: A Digital Twin for Regional Transportation Network Design and Evaluation

Jane Macfarlane
Babur, Ismaeel
Grieves, Michael
Hua, Edward Y.
2024

Mobiliti is introduced as a foundation for a Digital Twin for managing transportation systemsTransportation systems across metropolitan regions and for planning and designing urban networks. Regional transportation systemsTransportation systems consist of interconnected subnetworks, each governed by different municipalities. Although localization simplifies analysis, transportation projects must be evaluated within the context of the larger regional network due to their potential impacts on overall network performance. The computational challenges of simulating metropolitan networks are...

Light Rail System Safety Improvements Using ITS Technologies

Chira-chavala, Ted
Coifman, Ben
Empey, Dan
Mark Hansen
Lechner, Ed
Porter, Chris
1997

This report describes research which studied identifying and analyzing the effectiveness of countermeasures designed to reduce light rail crashes. Focus is in collisions with road vehicles at intersections. The light rail system for the Santa Clara County Transportation Agency in California served as the focus of the study.

Improving Transit Performance with Advanced Public Transportation System Technologies

Mark Hansen
Qureshi, Mohammad
Rydewski, Daniel
1994

This report identifies opportunities to improve transit performance using Advanced Public Transportation System (APTS) Technologies, assesses transit operator viewpoints on and experiences with APTS technologies, and proposes how current adoption and utilization practices might be improved so that these technologies are used in a more efficient and effective manner.The research consisted of three main phases. First, we identified APTS technologies and developed a framework for assessing their potential value in improving transit system performance. We considered three types of APTS...

Integrating Urban Air Mobility into the Power Grid through Smart Charging Solutions

Wu, Jiaman
Cao, Shangqing
Mark Hansen
Marta Gonzalez
2025

Adapting the existing power grid to support large-scale urban air mobility (UAM) operations using electric vertical take-off and landing (eVTOL) aircraft presents a critical infrastructural challenge that needs to be tackled. To this end, this paper presents a framework for estimating the potential of smart charging to improve power system welfare when integrating large-scale UAM into the power grid. We first estimate passenger travel demand for UAM from location-based service (LBS) data. Then we obtain the feasible charging window of aircraft by solving a fleet dispatching problem to...

Street Context of Various Demographic Groups in their Daily Mobility

Salgado, Ariel
Li, Weixin
Alhasoun, Fahad
Caridi, Inés
Marta Gonzalez
2021

We present an urban science framework to characterize phone users’ exposure to different street context types based on network science, geographical information systems (GIS), daily individual trajectories, and street imagery. We consider street context as the inferred usage of the street, based on its buildings and construction, categorized in nine possible labels. The labels define whether the street is residential, commercial or downtown, throughway or not, and other special categories. We apply the analysis to the City of Boston, considering daily trajectories synthetically generated...

Cities as Complex Systems—Collection Overview

Rybski, Diego
Marta Gonzalez
2022

This collection provides a contemporary excerpt of “Cities as complex systems”. The contributions have been submitted between April and October 2020. We briefly discuss example papers addressing the themes “urban scaling”, “urban mobility”, “flows in cities”, “spatial analysis”, “information technology and cities”, and “cities in time”. After motivating the intersection of cities and complexity, we provide an introduction and additional thoughts on urban scaling.

Intelligent Transport Systems

Elizabeth Deakin
Karen Trapenberg Frick
Alexander Skabardonis
2009

If you've seen an electronic message sign alongthehighwaythattells you how long it will take to get downtown or to the airport, or paid your toll or your parking fees with an electronic tag, or ridden a bus that triggered the traffic lights to turn green as it approached them, then you have experienced some of the benefits of Intelligent Transportation Systems (ITS)—an...

Background Paper: The General Transit Feed Specification (GTFS) Makes Trip-Planning Easier — Especially During a Pandemic — Yet its Use by California Agencies is Uneven

Karen Trapenberg Frick
Kumar, Tanu
Post, Alison
2020

The General Transit Feed Specification (GTFS) is an open source data format public transportation agency use to share information about routes and vehicle arrival and departure times. A variety of trip-planning applications, including Google Maps, rely on GTFS feeds to incorporate public transit information. In April 2020, the California Integrated Travel Project conducted a Feasibility Study that called for the widespread adoption of GTFS-static (GTFS-s) and GTFS-realtime (GTFS-r) to make transit simpler for California residents; however, there is little research on patterns of...