Search Results: 'Vehicle Routing Problem'

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10 results for "Vehicle Routing Problem"
OTREC-RR-11-05 By Miguel Figliozzi
eBook (PDF): $0.00
Reliable urban freight movement is crucial to companies using just-in-time approaches. Routes with long computation times are inefficient , as are those ignoring travel time, while using congested... More > arteries and streets increases costs and exacerbates issues like greenhouse gases, air pollution, noise, and accidents. Mobile phones and routing devices improve driver/scheduler communication, allowing dynamic vehicle reassignment, stop order modification or diversion en-route, but only with fast routing methods. Travel time variation during peak hours is a major problem for models using constant vehicle speeds. Time-dependent routing research is meager and current methods are inadequate for real operations. Faster methods are essential to utilize real time information. This research aims to develop and evaluate new methods for routing in urban areas, emphasizing improved running times for existing methods.< Less
OTREC-RR-11-05 By Miguel Figliozzi
Paperback: $6.90
Prints in 3-5 business days
Reliable urban freight movement is crucial to companies using just-in-time approaches. Routes with long computation times are inefficient , as are those ignoring travel time, while using congested... More > arteries and streets increases costs and exacerbates issues like greenhouse gases, air pollution, noise, and accidents. Mobile phones and routing devices improve driver/scheduler communication, allowing dynamic vehicle reassignment, stop order modification or diversion en-route, but only with fast routing methods. Travel time variation during peak hours is a major problem for models using constant vehicle speeds. Time-dependent routing research is meager and current methods are inadequate for real operations. Faster methods are essential to utilize real time information. This research aims to develop and evaluate new methods for routing in urban areas, emphasizing improved running times for existing methods.< Less
OTREC-RR-11-05 By Miguel Figliozzi
eBook (PDF): $0.00
Reliable urban freight movement is crucial to companies using just-in-time approaches. Routes with long computation times are inefficient , as are those ignoring travel time, while using congested... More > arteries and streets increases costs and exacerbates issues like greenhouse gases, air pollution, noise, and accidents. Mobile phones and routing devices improve driver/scheduler communication, allowing dynamic vehicle reassignment, stop order modification or diversion en-route, but only with fast routing methods. Travel time variation during peak hours is a major problem for models using constant vehicle speeds. Time-dependent routing research is meager and current methods are inadequate for real operations. Faster methods are essential to utilize real time information. This research aims to develop and evaluate new methods for routing in urban areas, emphasizing improved running times for existing methods.< Less
OTREC-RR-11-05 By Miguel Figliozzi
eBook (PDF): $0.00
Reliable urban freight movement is crucial to companies using just-in-time approaches. Routes with long computation times are inefficient , as are those ignoring travel time, while using congested... More > arteries and streets increases costs and exacerbates issues like greenhouse gases, air pollution, noise, and accidents. Mobile phones and routing devices improve driver/scheduler communication, allowing dynamic vehicle reassignment, stop order modification or diversion en-route, but only with fast routing methods. Travel time variation during peak hours is a major problem for models using constant vehicle speeds. Time-dependent routing research is meager and current methods are inadequate for real operations. Faster methods are essential to utilize real time information. This research aims to develop and evaluate new methods for routing in urban areas, emphasizing improved running times for existing methods.< Less
OTREC-RR-09-07 By Miguel Figliozzi
Paperback: $6.75
Prints in 3-5 business days
This paper studies approximations to the average length of Vehicle Routing Problems (VRP). The approximations are valuable for strategic and planning analysis of transportation and logistics... More > problems. The research focus is on VRP with varying number of customers, demands, and locations. This modeling environment can be used in transport and logistics models that deal with a distribution center serving an area with daily variations in the demand. The routes are calculated daily based on what freight is available. New approximations and experimental settings are introduced. Average distance travelled is estimated as a function of the number of customers served and the number of routes needed. Approximations are tested in instances with different customer spatial distributions, demand levels, number of customers, and time windows, Regression results indicate that the proposed approximations can reasonably predict the average length of VRP problems in randomly generated problems and real urban networks.< Less
OTREC-RR-09-07 By Miguel Figliozzi
eBook (PDF): $0.00
This paper studies approximations to the average length of Vehicle Routing Problems (VRP). The approximations are valuable for strategic and planning analysis of transportation and logistics... More > problems. The research focus is on VRP with varying number of customers, demands, and locations. This modeling environment can be used in transport and logistics models that deal with a distribution center serving an area with daily variations in the demand. The routes are calculated daily based on what freight is available. New approximations and experimental settings are introduced. Average distance travelled is estimated as a function of the number of customers served and the number of routes needed. Approximations are tested in instances with different customer spatial distributions, demand levels, number of customers, and time windows, Regression results indicate that the proposed approximations can reasonably predict the average length of VRP problems in randomly generated problems and real urban networks.< Less
OTREC-RR-12-10 By Miguel Figliozzi
eBook (PDF): $0.00
Increased urban congestion during peak periods increases logistics costs. In addition, environmental, social, and political pressures to limit the impacts associated with CO2 emissions are mounting... More > rapidly. A key challenge for transportation agencies and businesses is to improve the efficiency of urban freight and commercial vehicle movements while ensuring environmental quality, livable communities, and economic growth. Efforts to analyze and quantify the impacts of congestion and freight public policies on carriers operations and CO2 emissions are hindered by the complexities of vehicle routing problems with time-dependent travel times and the lack of congestion data. This research focuses on the analysis of costs and CO2 emissions for different levels of congestion and time-definitive demands. We use travel time data from an archive of sensors, time-dependent routing algorithms, and problems-instances with different binding constraints to analyze the impacts of congestion on commercial vehicle emissions.< Less
OTREC-RR-12-10 By Miguel Figliozzi
Paperback: $5.38
Prints in 3-5 business days
Increased urban congestion during peak periods increases logistics costs. In addition, environmental, social, and political pressures to limit the impacts associated with CO2 emissions are mounting... More > rapidly. A key challenge for transportation agencies and businesses is to improve the efficiency of urban freight and commercial vehicle movements while ensuring environmental quality, livable communities, and economic growth. Efforts to analyze and quantify the impacts of congestion and freight public policies on carriers operations and CO2 emissions are hindered by the complexities of vehicle routing problems with time-dependent travel times and the lack of congestion data. This research focuses on the analysis of costs and CO2 emissions for different levels of congestion and time-definitive demands. We use travel time data from an archive of sensors, time-dependent routing algorithms, and problems-instances with different binding constraints to analyze the impacts of congestion on commercial vehicle emissions.< Less
OTREC-RR-12-09 By Miguel Figliozzi et al.
Paperback: $5.44
Prints in 3-5 business days
A healthy and efficient transit system is indispensable to reduce congestion, emissions, energy consumption, and car use in urban areas. This research aims to develop methods to evaluate and... More > visualize bus service reliability for transit agencies; identify the unreliability trends of bus routes to understand their causes and effects; and model service times using linear regression models. Six months of vehicle location and passenger count data from a low-performance route in Portland was used for this research. Route 15 has experienced problems with schedule adherence and headway regularity. We developed methods to summarize causes of bus bunching, first determining the frequency of each cause. Next we demonstrated how results change using varying difficulty levels of bus bunching thresholds. Finally we investigated how results vary in different areas. This research also developed new ways to summarize and visualize vast amounts of bus route data in an insightful and intuitive manner.< Less
OTREC-RR-12-09 By Miguel Figliozzi et al.
eBook (PDF): $0.00
A healthy and efficient transit system is indispensable to reduce congestion, emissions, energy consumption, and car use in urban areas. This research aims to develop methods to evaluate and... More > visualize bus service reliability for transit agencies; identify the unreliability trends of bus routes to understand their causes and effects; and model service times using linear regression models. Six months of vehicle location and passenger count data from a low-performance route in Portland was used for this research. Route 15 has experienced problems with schedule adherence and headway regularity. We developed methods to summarize causes of bus bunching, first determining the frequency of each cause. Next we demonstrated how results change using varying difficulty levels of bus bunching thresholds. Finally we investigated how results vary in different areas. This research also developed new ways to summarize and visualize vast amounts of bus route data in an insightful and intuitive manner.< Less

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