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Improving Freight Transport Mobility and Efficiency via Synchronization
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2024-06-01
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[PDF-1.24 MB]
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Edition:Final Report (June, 2024)
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Abstract:A critical operational issue in the integrated vehicle routing and scheduling problem with cross- dock (IVRSPCD) is disruption to enroute pickup vehicles due to traffic accidents or mechanical failures. Such disruptions are not uncommon in practice and have widespread negative impacts on the system, including late vehicle arrivals to suppliers, cross-dock (CD), and customers, modification of cross-dock (CD) operational plans, and increased transportation costs for the carrier. This study contributes to the IVRPCD literature by proposing a reactive recovery system that integrates the routing of vehicles and scheduling in response to the breakdown of a pickup vehicle to mitigate the negative impact of such disruptions. To this end, a model is developed using an iterative information exchange (IIE) protocol between drivers, the dispatcher, and the CD operator to synchronize vehicle arrivals at the CD. The reactive recovery system consists of two main components: an integrated vehicle routing and scheduling model for normal conditions (IVRSPCD-normal) and one for disruption conditions (IVRSPCD-disruption). To demonstrate the effectiveness of the developed IVRSPCD models, numerical experiments are performed on a hypothetical network. Results from the numerical experiments showed that the proposed IIE protocol is effective in lowering the makespan and total delay in the event of a disruption. The CD makespan is primarily affected by the start time of the vehicle breakdown and communication delay. The delay at the supplier locations is affected by both the number of unserved nodes due to vehicle breakdown and the start time of the vehicle breakdown and communication delay. The same is true for the delay at the customer locations; however, there is an additional interaction effect between the two variables. The same finding applies to the case where the delay for both suppliers and customers is considered.
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