| 1. |
- Allen, Julian, et al.
(författare)
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Sustainability Strategies for City Logistics
- 2015
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Ingår i: Green Logistics: Improving the Environmental Sustainability of Logistics, McKinnon, A., Browne, M., Whiteing, A. and Piecyk, M. (eds.) Third Edition. - London : Kogan Page. - 9780749471859
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Bokkapitel (refereegranskat)
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| 2. |
- Brettmo, Alena, et al.
(författare)
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The role of intermediary organizations in influencing urban deliveries to receivers/establishments
- 2017
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Most urban freight research has focused on the need to change the behaviour of transport operators (carriers) either through incentives or more commonly through regulation. In the past few years researchers have started to address the scope to involve receivers (mainly retailers) in the reduction of urban freight trips. Typical initiatives include joint procurement or the possible use of consolidation centres. However, this focus on carriers and receivers potentially ignores the role of intermediary organisations that can strongly influence the patterns of urban freight movements and the way in which deliveries are made in urban centres. These intermediary organizations cover a wide variety of types including: Business Improvement Districts (BIDs), public sector purchasing coordinators that establish framework contracts and in the private sector - facilities managers. The paper explores the activities of 10 intermediary organisations in Sweden, UK and USA. An exploratory case study approach has been adopted and the activities of the organisations are summarised in order to enable acomparative assessment to be made. Findings support the contention that intermediary organisations have a powerful role to play in influencing urban freight demand and that their ability to bring together individual receivers is a significant opportunity for achieving more rapid and profound changes in urban freight flows and vehicle movements. The scope for changing procurement in both the public and private sector is also highlighted as one outcome of the research.
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| 3. |
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| 4. |
- Browne, Michael, et al.
(författare)
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Urban Logistics and Freight Transport
- 2021
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Ingår i: International Encyclopedia of Transportation. - : Elsevier. - 9780081026724 ; , s. 178-183
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Bokkapitel (refereegranskat)abstract
- Urban logistics and freight transport are essential activities for cities and involve complicated interactions between the public and private sectors. Cities are growing and urban logistics is becoming more important. However, freight transport, storage, deliveries, loading, and unloading also create negative impacts related to energy use, emissions, noise, and safety. As a result, public authorities need to consider a wide range of initiatives to mitigate these impacts and to ensure that urban logistics can function efficiently. This chapter outlines the main features of urban logistics and considers seven categories of initiatives where the public and private sector interact. The categories are illustrated with examples from cities and projects on an international level, drawing on the increasing level of research interest in this field.
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| 5. |
- Gonzalez-Calderon, Carlos A., et al.
(författare)
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Characterization and analysis of metropolitan freight patterns in Medellin, Colombia
- 2018
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Ingår i: European Transport Research Review. - : Springer Science and Business Media LLC. - 1867-0717 .- 1866-8887. ; 10:2
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Tidskriftsartikel (refereegranskat)abstract
- This paper seeks to pilot test a novel way to collect freight and service activity data and analyze the collected data in the metropolitan area of Medellin, Colombia. This research collects data using a multi-layer and multi-actor approach that includes surveys to receivers, suppliers, carriers, and truck drivers. The data are used by the authors to describe the overall freight patterns in the area of study and to show lessons learned. The data collection resulted in 2947 establishments (4.4% of the total establishments in the city), a cordon survey of 2950 commercial vehicles (17% of the total vehicle volume) accessing the urban area, and carrier interviews to ten companies and 130 truck drivers. The results indicate that a total of 33,274 metric tons/day enter the study area, 35,240 tons/day leave the area; while 7000 tons/day are distributed in the study area. In terms of freight trips, 6600 trips/day enter the study zone and 6600 trips/day leave it. The data collection effort enabled the analyses of freight generation patterns. The freight surveys used in the study complement each other, and provided a good depiction of the freight movements in urban areas. It was found that in the Medellin Metropolitan Area, freight-intensive sector establishments generates, on average, significantly more cargo (freight attraction plus production) than the service-intensive sectors. The analyses of the surveys allow the decision makers to understand the nature of the cargo and the generation patterns in different type of establishments. This characterization of the freight patterns is vital for the forecasting of the behavior of the cargo and it is the main input to perform freight demand modeling for city planning, especially for developing countries, where there are too many budget constraints.
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| 6. |
- Gonzalez-Calderon, Carlos, et al.
(författare)
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Generalized noortman and van es’ empty trips model
- 2021
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Ingår i: Transportation Research Part A: Policy and Practice. - : Elsevier BV. - 0965-8564. ; 145, s. 260-268
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a generalized Noortman and Van Es’ empty trips model that considers commodity groups and vehicle types. The model allows the analyst to quantify the contribution of empty trips by the various types of commodities. The model was validated using data collected in Colombia as part of the national Freight Origin-Destination Survey. The results reveal that not all commodities generate empty trips in similar proportions, and commodities that require specialized equipment are the ones with the largest proportion of empty trips generated. Moreover, the results show that the proportions of empty trips generated by a given commodity varies across vehicle types. The key contribution of the model is that it produces more precise estimates of empty trips as it includes the impacts of the cargo type in the generation of empty trips. The proposed model could be used by planners to identify key commodities that could be paired together with equipment that could be repurposed to reduce empty trips in their regions.
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| 7. |
- Holguin-Veras, Jose, et al.
(författare)
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A Multiclass Tour Flow Model and Its Role in Multiclass Freight Tour Synthesis
- 2020
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Ingår i: Transportation Science. - : Institute for Operations Research and the Management Sciences (INFORMS). - 0041-1655 .- 1526-5447. ; 54:3, s. 631-650
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Tidskriftsartikel (refereegranskat)abstract
- This paper summarizes the research conducted by the authors concerning the development of an analytical freight demand model that explicitly considers freight pickup and delivery flows by industry sector, the multiclass tour flow model (MC-TFM). The mathematical properties of the resultant model are investigated, including the convexity of the optimization model, the interconnection between the MC-TFM and the family of gravity models, and the MC-TFM's elasticities. The MC-TFM is then integrated into a multiclass freight tour synthesis model (MC-FTS) that is capable of inferring freight tour demand on the basis of secondary data such as traffic counts and estimates of freight trip generation by industry sector. The ability of the resulting MC-FTS is tested by means of numerical experiments involving test cases.
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| 8. |
- Holguín-Veras, José, et al.
(författare)
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Fostering unassisted off-hour deliveries: the role of incentives
- 2017
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Ingår i: Transportation Research Part A: Policy and Practice. - : Elsevier BV. - 0965-8564. ; 102, s. 172-187
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the chief findings of research conducted to assess the willingness of receivers of supplies to accept unassisted off-hour deliveries (U-OHD), which are those conducted outside regular business hours and without the assistance of the receiving establishment staff. U-OHD have potential to increase economic competitiveness, reduce congestion, improve environmental conditions, enhance livability, and increase quality of life in urban areas. This study considers the role that public policy initiatives could play in fostering receivers’ acceptance of U-OHD by analyzing survey data collected from potential U-OHD adopters. The paper describes the survey conducted, performs descriptive analyses of the data, analyzes the respondents’ stated willingness to participate in unassisted off-hour deliveries, estimates discrete choice models to gain insight into receivers’ decision-making processes, and analyzes the effectiveness of alternative policy scenarios. It is found that a number of policy levers can foster U-OHD: (1) public sector provision of a one-time incentive, a public recognition program, and business support services; (2) carriers providing shipping discounts to receivers of U-OHD; and (3) the creation of a Trusted Vendor Certification Program.
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| 9. |
- Holguín-Veras, José, et al.
(författare)
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Freight Demand Management and the Potential of Receiver-Led Consolidation Programs
- 2016
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Ingår i: Transportation Research Part A: Policy and Practice. - : Elsevier BV. - 0965-8564. ; 84, s. 109-130
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Tidskriftsartikel (refereegranskat)abstract
- The paper defines the field of Freight Demand Management (FDM), and positions it as an important component of transportation policy and management. To establish the rationale for FDM, the paper studies the effects of the agent interactions at the core of supply chains, and identifies the important role played by the receivers of supplies in determining when and how deliveries are made. The paper classifies the various modalities of FDM, and summarizes the real-life experiences of their implementation. To illustrate the potential of FDM, the paper analyzes Receiver-Led Consolidation (RLC) programs. The paper provides background on consolidation programs, and estimates a behavioral model to shed light on the factors explaining receivers’ interest in cargo consolidation. The resulting model is used to estimate expected participation in a RLC program in New York City. These results are complemented with freight-trip generation analyses, and a behavioral micro-simulation to estimate potential reductions in freight traffic and vehicle-miles-traveled. The results show that RLC programs could bring significant benefits to large metropolitan areas, reducing freight vehicle-miles-traveled and congestion levels.
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| 10. |
- Holguín-Veras, José, et al.
(författare)
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Freight mode choice: Results from a nationwide qualitative and quantitative research effort
- 2021
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Ingår i: Transportation Research Part A: Policy and Practice. - : Elsevier BV. - 0965-8564. ; 143, s. 78-120
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Tidskriftsartikel (refereegranskat)abstract
- The research reported in this paper focused on studying various aspects of freight mode choice in the continental United States (US) including the influencing factors, the development of econometric models to assess the impacts of public-sector policies and changes in market conditions. To gain insight into this complex subject, the team used qualitative and quantitative research techniques. The qualitative effort involved In-Depth Interviews (IDIs) with a highly selective group of leading shippers, carriers, and receivers. The IDIs provided insight into the key factors that influence mode choice, and the barriers that limit mode shifts. The quantitative effort estimated econometric models that express freight mode choice as a function of key independent variables. A unique aspect of this research is that the models were estimated using high-quality confidential data under the custody of the United States’ Census Bureau, the Internal Revenue Service, and the Surface Transportation Board, including: the Commodity Flow Survey (CFS), the largest shipper survey in the world; the Longitudinal Business Database (LBD), a comprehensive registry of commercial establishments in the US; and the Waybill Sample, a 5% sample; together with custom-made datasets of modal characteristics prepared by the authors. Using these data, the team estimated discrete-continuous freight mode choice models representing the choice of rail or truck for 42 different commodity types, and different combinations of independent variables and weighting schemes. The paper concludes with a discussion of the policy implications of the research conducted.
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