Sidewalk rage, also known as pedestrian rage or pedestrian aggressiveness syndrome, is aggressive or angry behavior exhibited by pedestrians. [1] [2] Sidewalk rage is a common phenomenon in cities with crowded sidewalks. [3] Sidewalk rage can be directed at other pedestrians, cyclists, or drivers. [4] Pedestrian-on-pedestrian sidewalk rage is often in response to slow walkers (see preferred walking speed). [5]