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- Holguín-Veras, J., et al.
(författare)
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The New York city off-hour delivery program: A business and community-friendly sustainability program
- 2018
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Ingår i: Interfaces. - : Institute for Operations Research and the Management Sciences (INFORMS). - 0092-2102 .- 1526-551X. ; 48:1, s. 70-86
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Tidskriftsartikel (refereegranskat)abstract
- The New York City Off-Hour Delivery (NYC OHD) program is the work of a private-public-academic partnership - A collaborative effort of leading private-sector groups and companies, public-sector agencies led by the New York City Department of Transportation, and research partners led by Rensselaer Polytechnic Institute. The efforts of this partnership have induced more than 400 commercial establishments in NYC to accept OHD without supervision. The economic benefits are considerable: The carriers have reduced operational costs and parking fines by 45 percent; the receivers enjoy more reliable deliveries, enabling them to reduce inventory levels; the truck drivers have less stress, shorter work hours, and easier deliveries and parking; the delivery trucks produce 55-67 percent less emissions than they would during regular-hour deliveries, for a net reduction of 2.5 million tons of CO2 per year; and citizens' quality of life increases as a result of reduced conflicts between delivery trucks, cars, bicycles, and pedestrians, and through the use of low-noise delivery practices and technologies that minimize the impacts of noise. The total economic benefits exceed $20 million per year. The success of the OHD program is due largely to the policy design at its core, made possible with the behavioral microsimulation. This unique optimization-simulation system incorporates the research conducted into an operations research/management science tool that assesses the effectiveness of alternative policy designs. This enabled the successful implementation of the project within the most complex urban environment in the United States.
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- 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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- 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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- Holguin-Veras, José, et al.
(författare)
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Importance and Potential Applications of Freight and Service Activity Models
- 2018
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Ingår i: City Logistics 1: New Opportunities and Challenges / edited by Eiichi Taniguchi, Russell G. Thompson.. - London & New York : Wiley-ISTE. - 9781786302052 ; , s. 45-63
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Bokkapitel (refereegranskat)abstract
- This chapter aims to raise awareness about the importance of the specific consideration of the needs of Freight and Service Activity (FSA) in transportation planning and management efforts. It also aims to exemplify the potential application of establishment‐level FSA models to support these efforts. FSA encompasses a wide range of activities performed at commercial establishments. The freight side of FSA represents the pick‐up and delivery activity associated with the production and consumption of supplies. The chapter provides a summary of key features of urban economies and their relation to FSA. It briefly describes the data and approach used to estimate FSA models. The chapter summarizes the chief findings of the research. FSA models have multiple practical applications. This is possible because the establishment‐level nature of these models allows them to be used at various levels of geography, ranging from the state/metropolitan level to local analyses at the building level.
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