Which of these transportation AI innovations was first successfully demonstrated at scale in a commercial application?

Artificial intelligence has transformed the transportation industry in numerous ways over the past decade. From predictive maintenance to autonomous vehicles, AI applications are reshaping how we move people and goods. This trivia question tests your knowledge about a significant milestone in transportation AI history that changed the trajectory of the industry. Can you identify which development came first and truly opened the door for today's advanced transportation systems?

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Predictive maintenance systems for freight railways that reduced unplanned downtime by 75% (2013)
AI-powered traffic light optimization that reduced urban congestion by 25% in major cities (2015)
Autonomous truck platooning technology that completed a cross-country delivery route (2016)
Real-time passenger demand prediction for public transit that improved capacity utilization by 40% (2014)