So this couple were having their wedding pictures done on the busiest bridge in NYC, the famous Brooklyn Bridge. The white line you see there is the dividing line between cyclists and pedestrians. Please note you see people on both sides. Bikes come hurdling down their path and if someone is there they will often run them over or they will change lanes and often hit other pedestrians. As a photographer if you are not paying attentions to everyone around and behind you, you will bump someone or will get run over. Pay attention out there.
