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Paper

Seattle Microhub Delivery Pilot: Evaluating Emission Impacts and Stakeholder Engagement

 
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Publication: Case Studies on Transport Policy
Publication Date: 2023
Summary:

Urban freight deliveries using microhubs and e-cargo cycles have been gaining attention in cities suffering from congestion and emissions. E-cargo cycle deliveries and microhubs used as transshipment points in urban cores can replace trucks to make cities more livable. This study describes and empirically evaluates an e-cargo tricycle pilot conducted with multi-sector stakeholders in Seattle to report the potential benefits and pitfalls of such practices. The pilot held stakeholder workshop sessions to collect inputs of interest and expectations from the project. Mobile devices used by drivers on e-cargo tricycle and cargo van routes collected delivery data to use for empirical assessment. Total vehicle miles traveled and tailpipe carbon emissions served as performance metrics when comparing e-cargo tricycle and cargo van deliveries. The results showed the net-benefit of the microhub and e-cargo tricycle routes depend on the upstream operations when replenishing packages.

The participatory approach to pilot design also provided insights into the factors of a successful pilot, with implications for scaling future e-cargo cycle delivery systems in North American cities. Namely, microhubs’ ability to host alternative revenue sources and value-added services is a boon for long-term financial competitiveness. However, lack of digital/physical infrastructure and work training/regulations specific to e-cargo cycle delivery operations present a barrier.

Recommended Citation:
Gunes, Seyma, Travis Fried, and Anne Goodchild. “Seattle Microhub Delivery Pilot: Evaluating Emission Impacts and Stakeholder Engagement.” Case Studies on Transport Policy. Elsevier BV, November 2023. https://doi.org/10.1016/j.cstp.2023.101119.
Paper

Intersections and Non-Intersections: A Protocol for Identifying Pedestrian Crash Risk Locations in GIS

 
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Publication: International Journal of Environmental Research and Public Health
Volume: 16 (19)
Pages: 3565
Publication Date: 2019
Summary:

Intersection and non-intersection locations are commonly used as spatial units of analysis for modeling pedestrian crashes. While both location types have been previously studied, comparing results is difficult given the different data and methods used to identify crash-risk locations. In this study, a systematic and replicable protocol was developed in GIS (Geographic Information System) to create a consistent spatial unit of analysis for use in pedestrian crash modeling. Four publicly accessible datasets were used to identify unique intersection and non-intersection locations: Roadway intersection points, roadway lanes, legal speed limits, and pedestrian crash records. Two algorithms were developed and tested using five search radii (ranging from 20 to 100 m) to assess the protocol reliability. The algorithms, which were designed to identify crash-risk locations at intersection and non-intersection areas detected 87.2% of the pedestrian crash locations (r: 20 m). Agreement rates between algorithm results and the crash data were 94.1% for intersection and 98.0% for non-intersection locations, respectively. The buffer size of 20 m generally showed the highest performance in the analyses. The present protocol offered an efficient and reliable method to create spatial analysis units for pedestrian crash modeling. It provided researchers a cost-effective method to identify unique intersection and non-intersection locations. Additional search radii should be tested in future studies to refine the capture of crash-risk locations.

Authors: Haena Kim, Mingyu Kang, Anne Moudon, Linda Ng Boyle,
Recommended Citation:
Kang, Mingyu, Anne Vernez Moudon, Haena Kim, and Linda Ng Boyle. 2019. Intersections and Non-Intersections: A Protocol for Identifying Pedestrian Crash Risk Locations in GIS. International Journal of Environmental Research and Public Health 16, no. 19: 3565. https://doi.org/10.3390/ijerph16193565
Paper

Simulation-Based Analysis of Different Curb Space Type Allocations on Curb Performance

 
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Publication: Transportmetrica B: Transport Dynamics
Volume: 11 (1)
Pages: 1384-1405
Publication Date: 2023
Summary:

Curbspace is a limited resource in urban areas. Delivery, ridehailing and passenger vehicles must compete for spaces at the curb. Cities are increasingly adjusting curb rules and allocating curb spaces for uses other than short-term paid parking, yet they lack the tools or data needed to make informed decisions. In this research, we analyze and quantify the impacts of different curb use allocations on curb performance through simulation. Three metrics are developed to evaluate the performance of the curb, covering productivity and accessibility of passengers and goods, and CO2 emissions. The metrics are calculated for each scenario across a range of input parameters (traffic volume, parking rate, vehicle dwell time, and street design speed) and compared to a baseline scenario. This work can inform policy decisions by providing municipalities tools to analyze various curb management strategies and choose the ones that produce results more in line with their policy goals.

Authors: Thomas MaxnerDr. Andisheh RanjbariŞeyma Güneş, Chase Dowling (Pacific Northwest National Laboratory)
Recommended Citation:
Thomas Maxner, Andisheh Ranjbari, Chase P. Dowling & Şeyma Güneş (2023) Simulation-based analysis of different curb space type allocations on curb performance, Transportmetrica B: Transport Dynamics, 11:1, 1384-1405, DOI: 10.1080/21680566.2023.2212324
Paper

Ecommerce and Logistics Sprawl: A Spatial Exploration of Last-Mile Logistics Platforms

 
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Publication: Journal of Transport Geography
Volume: 112
Publication Date: 2023
Summary:

The rise of ecommerce helped fuel consumer appetite for quick home deliveries. One consequence has been the placing of some logistics facilities in proximity to denser consumer markets. The trend departs from prevailing discussion on “logistics sprawl,” or the proliferation of warehousing into the urban periphery. This study spatially and statistically explores the facility- and region-level dimensions that characterize the centrality of ecommerce logistics platforms. Analyzing 910 operational Amazon logistics platforms in 89 U.S. metropolitan statistical areas (MSAs) between 2013 and 2021, this study estimates temporal changes in distances to relative, population centroids and population-weighted market densities. Results reveal that although some platforms serving last-mile deliveries are located closer to consumers than upstream distribution platforms to better fulfill time demands, centrality varies due to facility operating characteristics, market size, and when the platform opened.

Ecommerce has transformed the “consumption geography” of cities. These transformations have major implications for shopping behaviors and retail channels, last-mile operations and delivery mode choice, the management and pricing of competing uses for street and curb space, and the spatial ordering and functional role of logistics land uses. In the latter case, researchers have observed a diversification of logistics platforms to more efficiently serve home delivery demand. These platforms range from “dark stores” and “microfullfilment centers” that fulfill on-demand deliveries and omni-channeled retail without a consumer facing storefront, multi-use urban distribution centers that convert unproductive sites (e.g., abandoned rail depots) to more lucrative land uses, and “microhubs” that stage transloading between cargo vans and e-bicycles suited for dense urban neighborhoods.

Logistics spaces play an important role in improving urban livability and environmental sustainability. Planning decisions scale geographically from the region-level to the curb. Facilities such as urban consolidation centers and loading zones can mitigate common delivery inefficiencies, such as low delivery densities and “cruising” for parking, respectively. These inefficiencies generate many negative externalities including climate emissions, air and noise pollution, congestion, and heightened collision risks, especially for vulnerable road users such as pedestrians and bicyclists. Limited commercial data has made it difficult, however, to observe spatial patterns with regards to ecommerce logistics platforms.

Using detailed proprietary data, this paper explores the evolving spatial organization of ecommerce logistics platforms. Given the company’s preeminence as the leading online retailer in the U.S., the paper presents Amazon as a case study for understanding warehousing and distribution (W&D) activity in the larger ecommerce space. Utilizing proprietary data on Amazon logistics facilities between 2013 and 2021, this research explores the geographic shape and explanatory dimensions of ecommerce within major U.S. metropolitan areas. In the following section, this study defines the state of research related to broader W&D land use and its implications to ecommerce’s distinct consumption geography. Afterwards, two methodologies for measuring logistics centrality are tested: a temporally relative barycenter-based metric, the prevailing method in literature, and another GIS-based, population-weighted service distance metric. The two measurements reveal nuances between facility- and region-level differences in the spatial organization of ecommerce platforms, which has yet to be fully researched. After presenting results from an exploratory regression analysis, this study discusses implications for future urban logistics land use and transport decisions.

Recommended Citation:
Fried, T., & Goodchild, A. (2023). E-commerce and logistics sprawl: A spatial exploration of last-mile logistics platforms. Journal of Transport Geography, 112, 103692. https://doi.org/10.1016/j.jtrangeo.2023.103692
Paper

Seeking Equity and Justice in Urban Freight: Where to Look?

 
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Publication: Transport Reviews
Publication Date: 2023
Summary:

What do equity and social justice mean for urban freight planning and management? New Urban Freight Lab paper reviews transportation and mobility justice theory and finds that urban freight issues are absent from these discussions, which primarily concern passenger and personal mobility. When urban freight is considered, authors usually discuss topics such as emissions, pollution, congestion, noise, and collisions. This paper looks more in-depth at urban freight justice, including access to essential goods, community governance, employment opportunities and barriers, and regional and global perspectives.

Urban freight systems embed and reflect spatial inequities in cities and imbalanced power structures within transport decision-making. These concerns are principal domains of “transportation justice” (TJ) and “mobility justice” (MJ) scholarship that have emerged in the past decade. However, little research exists situating urban freight within these prevailing frameworks, which leaves urban freight research on socio-environmental equity and justice ill-defined, especially compared to passenger or personal mobility discussions. Through the lens that derives from TJ and MJ’s critical dialogue, this study synthesizes urban freight literature’s engagement with equity and justice.

Namely, the review evaluates:

  • How do researchers identify equitable distributions of urban freight’s costs and benefits?
  • At what scale do researchers evaluate urban freight inequities?
  • And who does research consider entitled to urban freight equity and how are they involved in urban freight governance?

The findings help inform researchers who seek to reimagine urban freight management strategies within broader equity and justice discourse.

Decades-long growth in urbanization and the more recent surge in e-commerce have spurred concerns around the uneven impacts of freight’s swelling urban footprint. Transport scholars note increasing conflicts between freight vehicles and vulnerable road users, like bicyclists and pedestrians in dense urban areas. Meanwhile, environmental justice (EJ) scholars have long measured unequal exposure to freight traffic pollution along socio-economic and ethnic lines.

However, relatively few urban freight studies engage with social equity. Those that do usually avoid critical discussions contained in justice-oriented theory, instead portraying the movement of goods as an “apolitical science of circulation”. In the U.S., for instance, politicizing urban freight overlooks a history of city industrial zoning practices, infrastructure construction, exclusionary decision-making, and consequent path dependency that placed key logistics facilities including highways, manufacturing plants, warehouses and distribution centers disproportionately near low-income households and non-white, populations of color. The longitudinal effects of these institutional decisions are still largely visible today.

Transportation research also inconsistently defines and measures equity. In a review of equity in transportation literature, Lewis et al. describe equity as an empty conceptual space that “authors then fill … either explicitly with clearly defined arguments or implicitly with whatever idea of justice intuitively comes to mind” (p. 2). Arbitrarily engaging with equity concepts, the authors argue, creates confusion that is both normative (e.g. what does an equitable urban freight system look like?) and positive (e.g. what measurable thresholds determine whether an urban freight outcome is inequitable?). Consequently, most equity research measure unequal distributions of burdens and/or benefits but spend less time identifying when and why unequal distributions are unjust.

Therefore, this paper synthesizes prevailing discourse around equity and, by extension, justice in transportation research and urban freight literature.

Authors: Travis FriedDr. Anne Goodchild, Ivan Sanchez Diaz (Chalmers University), Michael Browne (Gothenburg University)
Recommended Citation:
Travis Fried, Anne Goodchild, Michael Browne & Ivan Sanchez-Diaz (2023). Seeking Equity and Justice in Urban Freight: Where to Look? Transport Reviews, DOI: https://doi.org/10.1080/01441647.2023.2247165
Paper

Testing Curbside Management Strategies to Mitigate the Impacts of Ridesourcing Services on Traffic

 
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Publication:  Transportation Research Record: Journal of the Transportation Research Board
Publication Date: 2020
Summary:

Increased use of ridehailing leads to increased pick-up and drop-off activity. This may slow traffic or cause delays as vehicles increase curb use, conduct pick-up and drop-off activity directly in the travel lane, or slow to find and connect with passengers. How should cities respond to this change in an effort to keep travel lanes operating smoothly and efficiently? This research evaluates two strategies in Seattle, WA, in an area where large numbers of workers commute using ridesourcing services: (i) a change of curb allocation from paid parking to passenger load zone (PLZ), and (ii) a geofencing approach by transportation network companies (TNCs) which directs their drivers and passengers to designated pick-up and drop-off locations on a block. An array of data on street and curb activity along three study blockfaces was collected, using video and sensor technology as well as in-person observations. Data were collected in three phases: (i) the baseline, (ii) after the new PLZs were added, expanding total PLZ curb length from 20 ft to 274 ft, and (iii) after geofencing was added to the expanded PLZs. The added PLZs were open to any passenger vehicle (not just TNC vehicles), weekdays 7:00–10:00 a.m. and 2:00–7:00 p.m. The results showed that the increased PLZ allocation and geofencing strategy reduced the number of pick-ups/drop-offs in the travel lane, reduced dwell times, increased curb use compliance, and increased TNC passenger satisfaction. The two strategies, however, had no observable effect on travel speeds or traffic safety in the selected study area.

Recommended Citation:
Ranjbari, Andisheh, Jose Luis Machado-León, Giacomo Dalla Chiara, Don MacKenzie, and Anne Goodchild. “Testing Curbside Management Strategies to Mitigate the Impacts of Ridesourcing Services on Traffic.” Transportation Research Record, (October 2020). https://doi.org/10.1177/0361198120957314.
Paper

Bike-Share Planning in Cities with Varied Terrain

 
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Publication: Institute of Transportation Engineers (ITE) Journal
Volume: 84:07:00
Pages: 31-35
Publication Date: 2014
Summary:
Decisions to install public bike-share programs are increasingly based on ridership estimations, but the topography’s influence on ridership is rarely quantified. This research evaluated a geographic information system-based approach for estimating ridership that accounted for hills. Double-weighting a slope relative to other measures produces a realistic representation of the bicycling experience. Because of their benefits, bike-share programs are increasingly of interest in cities and universities across the country. A bike-share program provides short-term use bicycles to the public through a system of unattended stations for their checkout and return. This research enhanced methodology developed in Philadelphia by developing and evaluating an additional indicator that accounts for hills. Several scenarios were tested, using Seattle as a case study, to find the best method to account for the notable impact of hills on bike riders’ choices and to evaluate the addition of slope to the calculation of bike-share demand.
Authors: Dr. Ed McCormack, Erica Wygonik, Daniel H. Rowe
Recommended Citation:
McCormack, E., & Rowe, D. H. (2014). Bike-share planning in cities with varied terrain. Institute of Transportation Engineers. ITE Journal, 84(7), 31.
Paper

An Evaluation of Logistics Sprawl in Chicago and Phoenix

 
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Publication: Journal of Transport Geography
Volume: 88
Publication Date: 2018
Summary:

This paper evaluates whether or not there is a sprawling tendency to the spatial patterns of warehouse establishments in the Chicago and Phoenix metropolitan areas. The trend of warehouses to move away from the urban centers to more suburban and exurban areas is referred to as “Logistics Sprawl”. To measure sprawl, the barycenter of warehousing establishments was compared to the barycenter of all other industry establishments in the region between the years of 1998 and 2013 for Chicago; 1998 and 2015 for Phoenix. This shows that logistics sprawl is a behavior experienced by warehouses in the Chicago area, but not in the Phoenix area. This paper discusses if logistics sprawl is a national trend or a regional behavior by comparing these results to the previous case studies of the Atlanta, Los Angeles, and Seattle metropolitan areas.

Authors: Dr. Anne Goodchild, Melaku Dubie, Kai C. Kuo
Recommended Citation:
Dubie, Melaku, Kai C. Kuo, Gabriela Giron-Valderrama, and Anne Goodchild. (2018) An Evaluation of Logistics Sprawl in Chicago and Phoenix. Journal of Transport Geography, 88, 102298–. https://doi.org/10.1016/j.jtrangeo.2018.08.008
Paper

Evaluating the Impacts of Density on Urban Goods Movement Externalities

Publication: Journal of Urbanism: International Research on Placemaking and Urban Sustainability
Volume: 10:04
Pages: 13-Jan
Publication Date: 2017
Summary:

Research has established a potential to reduce vehicle miles traveled (VMT) by replacing passenger travel for shopping with delivery service, and a few studies have indicated CO2 emissions can also be reduced. However, that research has mostly focused on urban locations and has not addressed criteria pollutants. This study examines the impacts of replacing passenger travel for shopping with delivery service over a broader set of externalities (VMT, CO2, NOx, and PM10) in both urban and rural communities. Three different goods movement strategies are considered in three different municipalities in King County, Washington, which vary in size, density, and distance from the metropolitan core. The research finds that delivery services can reduce VMT over passenger vehicle travel for shopping, however, the potential to reduce CO2, NOx, and PM10 emissions varies by municipality. Significant trade-offs are observed between VMT and emissions – especially between VMT and criteria pollutants.

Authors: Dr. Anne Goodchild, Erica Wygonik
Recommended Citation:
Wygonik, Erica, and Anne Goodchild. Evaluating the Impacts of Density on Urban Goods Movement Externalities. Journal of Urbanism: International Research on Placemaking and Urban Sustainability 10, no. 4 (2017): 487-499. 
Thesis: Array
Paper

Current State of Estimation of Multimodal Freight Project Impacts

 
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Publication: Transportation Research Record: Journal of the Transportation Research Board
Volume: 2410
Pages: 141-149
Publication Date: 2014
Summary:

As available data have increased and as the national transportation funding bills have moved toward objective evaluation, departments of transportation (DOTs) throughout the United States have begun to develop tools to attempt to measure the effects of different projects. Increasingly, DOTs recognize that the freight transportation system is necessarily multimodal. However, no DOTs have clearly stated objective tools with which to evaluate multimodal freight project comparisons.

This paper fills that gap by summarizing the existing academic literature on the state of the science for the estimation of freight project impacts and by reviewing methods currently used by selected DOTs nationwide. These methods are analyzed to identify common themes to determine potential avenues for multimodal project evaluation.

Authors: Dr. Anne Goodchild, Erica Wygonik, Daniel Holder, B. McMullen
Recommended Citation:
Wygonik, Erica, Daniel Holder, B. Starr McMullen, and Anne Goodchild. "Current State of Estimation of Multimodal Freight Project Impacts." Transportation Research Record 2410, no. 1 (2014): 141-149.