The introduction of clean hydrogen as a future energy commodity has prompted significant interest in developing dedicated transportation and storage infrastructures as an enabler for cross-border hydrogen trade and cost-efficient supply. This paper addresses the complex challenges associated...

In this paper, we consider a variant of the Pickup and Delivery Problem (PDP), where any demand may be dropped off elsewhere other than its destination, picked up later by the same or another vehicle, and so on until it has reached its destination. We discuss the complexity of this problem and...