Which factor primarily influences the selection of a transportation mode in logistics?

The selection of a transportation mode in logistics is primarily influenced by distance and time because these two factors directly impact the efficiency and effectiveness of the supply chain. The distance a shipment needs to travel plays a crucial role in determining the most suitable transportation option, as longer distances may require modes that can cover those distances effectively, such as rail or air transportation.

Time sensitivity is equally important; certain goods need to be delivered quickly, necessitating faster modes of transportation, such as air freight, despite potentially higher costs. In contrast, for less time-sensitive goods, slower modes like ocean freight might be more economical.

Thus, the interplay between distance and time helps logistics professionals evaluate trade-offs between speed, cost, and service level, making these factors critical in choosing the appropriate transportation mode.