01337975

Component

https://doi.org/10.3141/2224-02

http://scholar.google.com...hild&publication_year=2011

A case study of the University of Washington Mailing Service, which operates a heterogeneous fleet of vehicles, provides insight into the impact of operational changes on cost, service quality, and emissions. An emissions minimization problem was formulated and solutions were identified with a creation and local search algorithm based on the I1 and 2-opts heuristics. The algorithm could be used to find many solutions that could improve existing routing on both cost and emissions metrics, reduce emissions by an average of almost 6%, and reduce costs by an average of 9%. More significant cost and emissions savings could be found with service quality reductions. For example, reducing delivery frequency to once a day could lead to emissions and cost savings of close to 35% and 3%, respectively. Rules of thumb for vehicle assignment within heterogeneous fleets were explored to gain an understanding of simple implementations, such as assigning cleaner vehicles to routes with more customers and longer travel distances. This case study identified significant emissions reductions that could be obtained with minimal effects on cost and service and that offered new, practical applications that could be used by fleet managers interested in reducing their carbon footprint.

01353537

11-2639

English

pp 8-16

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167352

Print

Figures (2) ; References (21) ; Tables (2)

Algorithms; Case studies; Costs; Exhaust gases; Fleet management; Greenhouse gases; Package and mail service; Pickup and delivery service; Pollutants; Quality of service; Routes and routing; Trip length; Urban areas; Vehicle fleets

University of Washington

Emissions reduction; Vehicle assignment

Environment; Freight Transportation; Planning and Forecasting; I15: Environment; I72: Traffic and Transport Planning

TRIS, TRB, ATRI

Feb 17 2011 6:14PM

• Algorithms for Studying the Impact of Travel Time Reliability Along Multisegment Trucking Freight Corridors
• Estimating the Benefits of Performance-Based Standards Vehicles
• Freight Generation, Freight Trip Generation, and Perils of Using Constant Trip Rates
• Intermodal Container Flow Simulation Model and Its Applications
• Models for Minimizing Backhaul Costs Through Freight Collaboration
• Multicriteria Freeway Performance Measures for Trucking in Congested Corridors
• New Formulation for the Traveling Salesman Problem with Separation Requirement and Cost
• Online Freight Network Assignment Model with Transportation Disruptions and Recourse
• Supply Chain Broker Operations: Network Perspective
• Time-Dependent Effects on Parameters of Freight Demand Models: Empirical Investigation