In 1961, traffic psychologist Karl Peglau suggested to the East German Ministry of Transport that each group of road users should have its own traffic light. He developed special signs for pedestrian traffic lights, depicting a standing or walking pedestrian. The  East German pedestrian traffic light signals (“Ampelmännchen”) were introduced in 1969 in East Berlin at the Unter den Linden/Friedrichstraße intersection after years of technical, scientific, and governmental testing. They were incorporated into the East German traffic signal standard as official pedestrian signals in 1970. After reunification in 1990, the East German Ampelmännchen were gradually replaced with the West German Ampelmännchen in the former East German territory. This led to protests among the population. Subsequently, East German Ampelmännchen were (re)introduced in both East and West German cities. We celebrate this feat of technology with a special signal depicting Jacobian pilgrims …