Which of these AI transportation innovations was successfully implemented by Transport for London to improve customer experience?

The transportation industry is rapidly evolving with artificial intelligence transforming how public transit systems operate and serve passengers. From predictive maintenance to personalized route planning, AI is creating smarter, more efficient transportation networks. This poll tests your knowledge about a groundbreaking AI implementation that dramatically improved customer experience in one major transit system. Can you identify which innovation actually exists?

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Hopper Fare Predictor - An AI system that automatically applies the cheapest fare combination across multiple journeys without passenger intervention
Mood-Based Route Planner - An AI that suggests transit routes based on facial recognition of passenger emotions and stress levels at station entry points
Social Density Navigator - A system that reroutes passengers based on their personal social media profiles to match them with like-minded commuters
Virtual Station Guide - An AI hologram that physically guides passengers through stations by projecting personalized 3D directions visible only to the requesting user