Stratumseind in Eindhoven is one of the busiest nightlife streets in the Netherlands. On a Saturday night, bars are packed, music blares through the street, laughter and drunken shouting bounces off the walls. As the night progresses, the ground becomes littered with empty shot bottles, energy drink cans, cigarette butts and broken glass. It’s no surprise that the place is also known for its frequent fights. To change that image, Stratumseind has become one of the “smartest” streets in the Netherlands. Lamp-posts have been fitted with wifi-trackers, cameras and 64 microphones that can detect aggressive behaviour and alert police officers...