Which AI-powered transportation innovation has most significantly reduced 'last-mile delivery' costs for retail companies since 2020?

The transportation industry is rapidly evolving with artificial intelligence transforming how we move people and goods. From self-driving vehicles to smart traffic management systems, AI is reshaping mobility solutions worldwide. This trivia question challenges your knowledge about a groundbreaking AI application in the transportation sector that's changing consumer behavior and retail logistics strategies.

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Autonomous delivery drones for urban package delivery
Self-driving semi-trucks for interstate freight transport
AI-optimized public transit routes for commuters
Smart traffic light systems that prioritize delivery vehicles