Which innovative advertising technique was first successfully implemented by Spotify in Stockholm's subway system, now widely adopted in transportation hubs worldwide?

Public transportation has become a dynamic canvas for innovative advertising. From digital displays that change based on location to interactive experiences that engage commuters during their journey, transit advertising continues to evolve. This poll tests your knowledge of a groundbreaking campaign that transformed how brands connect with urban commuters and significantly impacted the transportation advertising landscape.

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Context-aware digital displays that change advertisements based on train delays and weather conditions
Musical stairs that play personalized playlists when commuters walk on them, synced to their Spotify accounts
Mood-responsive station takeovers that displayed hyperlocal music recommendations based on that station's unique culture
Augmented reality billboards that allowed commuters to virtually try on headphones by scanning QR codes