Tech in A Day on Instagram: "German artist Simon Weckert used a simple red wagon and 99 second-hand smartphones to create "phantom" traffic jams across the streets of Berlin. By turning on location services on every device and walking slowly through nearly empty streets—including the road directly outside Google’s Berlin office—Weckert exploited the app’s crowdsourcing algorithm. Google Maps interpreted the dense cluster of slow-moving signals as a massive traffic jam, instantly turning "green"