Vinarna Certovka is a narrow path between the buildings in the old city part in Prague, next to Čertovka stream near Charles Bridge. In order to avoid people meeting in the middle, someone put a traffic light on each sides of the path. Vinarna Certovka is a narrow path between the buildings in the old city part in Prague, next to Čertovka stream near Charles Bridge. In order to avoid people meeting in the middle, someone put a traffic light on each sides of the path.