Traffic Signal. Berlin, Germany.

Aaron Naparstek is the founder and former editor-in-chief of Streetsblog. Based in Brooklyn, New York, Naparstek's journalism, advocacy and community organizing work has been instrumental in growing the bicycle network, removing motor vehicles from parks, and developing new public plazas, car-free streets and life-saving traffic-calming measures across all five boroughs. He was also one of the original cast members of the "War on Cars" podcast. You can find more of his work on his website.