Transportation Commons^™

Webinar: Modeling Freeway Traffic In A Mixed Environment: Connected And Human-Driven Vehicles, Xianfeng Terry Yang

TREC Webinar Series

Although connected vehicles (CVs) will soon go beyond testbeds, CVs and human-driven vehicles (HVs) will co-exist over a long period. Hence, it is critical to consider the interactions between these two types of vehicles in traffic flow modeling. In this study, we aim to develop a macroscopic model to understand how CVs would impact HVs in the traffic stream. Grounded on the second-order traffic flow model, we study the relationships among flow, density, and speed by two sets of formulations for the groups of CVs and HVs, respectively. A set of friction factors, which indicate CVs' impact to HVs, are …

Policy Brief, Center For Transportation, Equity, Decisions & Dollars

CTEDD Final Project Reports - Archive

No abstract provided.

Schedule Creep: In Search Of An Uncongested Baseline Block Time By Examining Scheduled Flight Block Times Worldwide 1986–2016, Terence P. C. Fan

Research Collection Lee Kong Chian School Of Business

Based on a stratified random sampling of airlines’ schedules for 200 heavily travelled directional nonstop airport pairs, this paper examines systematically how scheduled block times in non-stop flights have changed from 1986 to 2016. Three econometric analyses, by way of a 10th percentile quantile regression, 15th percentile quantile regression and ordinary least-squares regression, show that after accounting for the effects of air traffic growth, airport-specific congestion, flight delays, number of seat per flight, aircraft type, flight heading, airport slot policy, other airport-specific anomalies, airline-specific policies and changes in crude oil price, scheduled block times have been growing at a pace …

Research On Marketing Channel Of Container Lines, Bai Ge

International Transport and Logistics

No abstract provided.

The Changing Role Of Public-Private Partnerships In Urban Transportation: A Case Study Of The Rise Of P3s In Denver, Co, Sylvia Arriaga Brady

Electronic Theses and Dissertations

This research examines the expanding role of public-private partnerships (PPPs or P3s) in Denver metro transportation projects in three areas: (1) innovative funding and financing of transit infrastructure projects, (2) the partnerships between freight and passenger rail services, and (3) emerging collaborations of local governments, transit agencies, and transportation network companies (TNCs).

The purpose of the first study was to examine the recent use of P3s in the Denver Regional Transportation District's (RTD) FasTracks program, a 2004 voter-approved $4.7 billion transit expansion program. After a shortfall in funding, RTD partnered with several private consortia to enable the FasTracks program to …

Social Equity In Transit Service: Toward Social And Environmental Justice In Transportation, Torrey Lyons

TREC Theses and Dissertations

This dissertation explores social equity as it applies to public transportation. Transit has long been considered a tool to alleviate inequity by limiting the effects of spatial mismatch and providing access to opportunity to disadvantaged populations. This theory, however, has not been adequately proven empirically. The first chapter of this dissertation tests the theory that spatial mismatch is moderated by quality transit service. We do this by taking a cross section of the largest urban areas in the United States and applying structural equation modeling to identify relationships between exogenous and endogenous factors. We find that higher quality transit service …

Life In Hampton Roads Survey Press Release #6: Transportation, Social Science Research Center

Life in Hampton Roads Survey Report

[Introductory paragraph]

Every day, people traverse the eleven bridges and five tunnels in the Hampton Roads area, commuting for work, family, and other activities. The 2019 Life in Hampton Roads survey asked residents of the Hampton Roads area about their commute times and opinions on bridge and tunnels.

The Resilient City: A Platform For Informed Decision-Making Process, Paul Niculescu-Mizil Gheorghe, Jarutpong Vasuthanasub, Adrian Gheorghe

Engineering Management & Systems Engineering Faculty Publications

As over half of the world’s inhabitants lives in metropolises, the rapid growth in urbanization has made cities becoming more and more exposed and vulnerable to a broad spectrum of threats and hazards. In order to respond to such difficulties, a concept of resilience is considered a significant component for the long-term planning and sustainable development of the cities. “Resilient City” is a new paradigm that challenges the idealistic principle of stability and resistance to change implicitly in sustainable development and success. However, building a resilient city requires a holistic approach, as well as the appropriate adoption of knowledge and …

Final Project Report, Anurag Pande

CTEDD Final Project Reports - Archive

No abstract provided.

Rethinking Consumer Protection: Escaping Death By Regulation, Thomas L. Tacker

Publications

This book is designed to appeal to anyone who is at all interested in topics related to making life better and safer—for all us consumers. Our current approach to consumer protection is extremely flawed; sometimes costing lives rather than saving them. There are better ways to protect ourselves and the people we love.

Final Project Report, Kate Hyun, Courtney Cronley

CTEDD Final Project Reports - Archive

No abstract provided.

Final Project Report, Mouyid Islam

CTEDD Final Project Reports - Archive

No abstract provided.

Final Project Report, Shahereh Kermanshachi, Kelly Bergstrand

CTEDD Final Project Reports - Archive

No abstract provided.

Final Project Report, Subhrajit Guhathakurta, Amit Kumar

CTEDD Final Project Reports - Archive

No abstract provided.

A Study Of Sidewalk Autonomous Delivery Robots And Their Potential Impacts On Freight Efficiency And Travel, Dylan Jennings, Miguel A. Figliozzi

Civil and Environmental Engineering Faculty Publications and Presentations

E-Commerce and package deliveries are growing at a fast pace and there is an increased demand for same-day deliveries. Established delivery companies and new startups are investing in technologies that reduce delivery times and/or increase delivery drivers’ productivity. In this context, the adoption of Sidewalk Automated (or Autonomous) Delivery Robots (SADRs) has a growing appeal. SADRs are pedestrian sized robots that deliver items to customers without the intervention of a delivery person. Since SADRs travel on sidewalks they have been the subject of increasing regulation by local agencies in the US. The three research questions that guide this research effort …

An Initial Exploration Of The 2005 Iowa Rural Interstate Speed Limit Increase Using Linear Regression, Thomas Ryan Cook

Electronic Theses and Dissertations

Speed limit increases, particularly on interstates have been studied and researched many times over the course of the last 50 years in the United States. These research efforts began after the implementation of the National Maximum Speed Law (NMSL), which reduced all speed limits to a maximum of 55-mph. In the years that followed, this restriction was relaxed to 65-mph with the Surface Transportation and Uniform Relocation Assistance Act (STURAA) and ultimately repealed later by the National Highway System Designation Act (NHSDA). Since the repeal, states reacted in myriad of ways and many studies documented the changes of those reactions. …

Supply Chain Managers' Reverse Logistics Strategies To Control Cost Through Risk Mitigation, Lawrence A. Reeves

Walden Dissertations and Doctoral Studies

Supply chain managers in the food and beverage industry face significant challenges regarding the use of effective reverse logistics strategies to reduce supply chain disruptions, control risk, and reduce costs. Through the lens of resource dependence theory, the purpose of this multiple case study was to explore reverse logistics strategies used by supply chain managers in the United States to control cost through risk mitigation. Participants in this study included 5 supply chain managers in the food and beverage distribution industry in the state of Georgia who implemented successful reverse logistics strategies to control cost through risk mitigation. Data were …

Reducing Risk In Public-Private Partnership Contracts: Two Examples From Highway Tolling Projects, Martin Mayer, Juita-Elena Wie Yusuf, Lenahan L. O'Connell

School of Public Service Faculty Publications

In an effort to address financial constraints and environmental concerns states have increasingly turned to a combination of un-tolled (HOV) and tolled (HOT) lanes. Public-private partnerships (3Ps) are a popular mechanism for this more sustainable approach to highway infrastructure that couples environmental sustainability (efficient utilization of existing lanes, less congestion) with financial sustainability (private investment). This chapter offers an approach to 3P contract writing for HOV/HOT facilities that is structured by a stakeholder analysis of actors in the project accountability environment. By analyzing two Virginia 3P highway projects, the chapter shows it is possible to build into a contract a …

Data From: How Will Autonomous Vehicles Change Local Government Budgeting And Finance? Case Studies Of On-Street Parking, Curb Management, And Solid Waste Collection, Benjamin Y. Clark

TREC Datasets and Databases

Datafiles

Parking Occupancy Datasets: These CSV (comma separated values) datafiles include parking occupancy data from the Seattle Department of Transportation (SDOT). Each of the 11 datafiles indicates the time period that it includes, with dates ranging from January 1, 2012 to December 31, 2017. Each file contains 6 months of data on block-by-block occupancy of paid parking. The number of available spaces were calculated from this dataset in addition to the median and mean occupancy rates for each Tract. City data documentation indicates the following about the dataset: “The City of Seattle has created an on-street paid parking occupancy …

From College To The City: Implications Of Rail Transit On The Movement Of The Young, College Educated Into The City Center, Lenahan L. O'Connell, Juita-Elena Wie Yusuf, Timothy J. Brock, Benjamain Blandford

School of Public Service Faculty Publications

This chapter focuses on how investment in the American rail infrastructure has shaped changes in the population and residential patterns. Specifically, the chapter examines the association between commuter rail systems, urban rail transit systems, and the movement of the college-educated young into the inner city. Two hypotheses are proposed about the characteristics of rail systems and the relationship to the growth in the percentage of young college graduates residing in close-in neighborhoods. Using a sample of central cities within the 51 largest metropolitan areas in the U.S., the chapter compares the growth in young college graduates (ages 25 to 34 …