Publications

Summary:
This study explores what influences people’s willingness to use Autonomous Delivery Vehicles (ADVs), incorporating factors like social influence, environmental concern, enjoyment, and perceived security risks to better understand public perception.

Summary:
While e-commerce continues to grow as a proportion of retail sales, consumers still largely rely on vehicle travel to shop. At the same time, the “15-minute city” concept is gaining traction, suggesting that the livability and sustainability of urban areas will improve if essential goods and services are all located in close proximity to residential areas.

Summary:
Most of a delivery driver’s time is spent outside the vehicle, walking the last 50 feet to reach the delivery customers while the vehicle is stationary. However, little is known about the walking component of delivery routes, while most models and algorithms used for scheduling and planning urban freight vehicles focus solely on the driving component. This study fills this research gap by providing an empirical analysis of the role of walking in last-mile deliveries.

Summary:
Boston Delivers was an 18-month pilot project (running September 2023 through February 2025) led by the Boston Transportation Department in partnership with Net Zero Logistics and funded by MassCEC through the ACT4All program. The project tested the use of electric cargo bikes for neighborhood deliveries, aiming to reduce congestion, improve air quality, and support local businesses by replacing car and van trips with more sustainable, right-sized vehicles.

Summary:
As warehousing and distribution centers (W&D) rapidly expand, nearby communities, especially those that have been historically marginalized, face growing health risks from increased freight traffic. This research examines how local and state zoning decisions across the U.S. influence the placement and regulation of W&D facilities, and whether those actions consider environmental justice (EJ) principles.

Summary:
Problem, research strategy, and findings The transportation sector is the largest contributor of greenhouse gas emissions in the United States. To articulate how cities may combat rising emissions, municipalities throughout the country have produced climate action and sustainability plans that outline strategies to reduce their carbon footprints from transportation.

Summary:
Commercial electric vehicles (EVs) have increasingly gained interest from urban freight companies in the past decade due to the introduction of economic and policy drivers. Although these factors promote urban freight electrification, some barriers hinder the transition to fully electric fleets, such as the significant monetary investment required to replace the current internal combustion engine vehicles (ICEV) and the lack of readily available electric freight vehicles.

Summary:
This study introduces a first-of-a-kind modeling framework to evaluate the equity impacts of last-mile ecommerce delivery in U.S. cities. Analyzing data across 41 metropolitan areas, the research finds that populations of color experience significantly higher exposure to delivery traffic—about 35% more than white populations—despite ordering fewer packages. The framework helps planners assess baseline equity performance and test urban freight strategies.

Summary:
Imagine the frustration of searching for a misplaced item, like your house keys or wallet, before leaving for a night out. Now, picture a FedEx or Amazon delivery driver halfway through a tight morning route, struggling to locate a parcel due by 9 a.m. while parked right outside the customer’s address. These misloads — where shipments are accidentally loaded onto the wrong delivery route or vehicle — not only cause stress and lost time for the delivery driver but also...

Summary:
In 2023, Portland was awarded a U.S. Department of Transportation SMART grant to pilot a Zero-Emission Delivery Zone (ZEDZ). Funding for this Stage One SMART grant will allow PBOT to trial changing three to five truck loading zones into “Zero-Emission Delivery” loading zones in downtown Portland.

Summary:
With the dramatic and recent growth in demand for curbside pick-up and drop-off by ride-hailing services, as well as online shopping and associated deliveries, balancing the needs of roadway users is increasingly critical. Local governments lack tools to evaluate the impacts of curb management strategies that prioritize different users’ needs.

Summary:
Throughout the COVID-19 pandemic, online and in-store shopping behaviors changed significantly. As the pandemic subsides, key questions are why those changes happened, whether they are expected to stay, and, if so, to what extent. We answered those questions by analyzing a quasi-longitudinal survey dataset of the Puget Sound residents (Washington, U.S.).

Summary:
Millions of people who live and work in cities purchase goods online. As ecommerce and urban deliveries spike, there is an increasing demand for curbside loading and unloading space. To better manage city curb spaces for urban freight, city planners and decision makers need to understand commercial vehicle driver behaviors and the factors they consider when parking at the curb. Urban freight transportation is a diverse phenomenon.

Summary:
The purpose of this research is to explore consumers’ online shopping and in-person shopping travel behaviors and the factors affecting these behaviors within the geographical context of the study area of West Seattle. West Seattle is a peninsula located southwest of downtown Seattle, Washington State. In March 2020, the West Seattle High Bridge, the main bridge connecting the peninsula to the rest of the city, was closed to traffic due to its increased rate of structural deterioration.

Summary:
Common carrier parcel lockers have emerged as a secure, automated, self-service means of delivery consolidation in congested urban areas, which are believed to mitigate last-mile delivery challenges by reducing out-of-vehicle delivery times and consequently vehicle dwell times at the curb. However, little research exists to empirically demonstrate the environmental and efficiency gains from this technology.