Which recent supply chain innovation has most significantly reduced the 'empty miles' problem in transportation logistics?

The transportation industry's supply chain has undergone dramatic transformations in recent years, particularly in last-mile delivery. New technologies, changing consumer expectations, and sustainability concerns are reshaping how goods move from distribution centers to final destinations. This trivia question explores a significant innovation that has changed the economics and efficiency of transportation logistics.

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Digital freight matching platforms that connect shippers with available carriers in real-time
Autonomous delivery drones that operate independently of ground transportation networks
Centralized urban fulfillment centers that consolidate deliveries by neighborhood
Blockchain-based cargo tracking systems that verify shipment integrity