When photographing the New York subway, Davidson had to prepare him self. He was not used to this environment when photographing, he had to 'prepare' himself to go into the subway and start taking pictures, he tried getting more physically fit and prepare for any situation he may encounter while making his work. He saw the graffiti on the walls as a mark of territory and because he did not understand the graffiti so he did not feel like he was safe or in that area.
Davidson used a variety of techniques while photographing on the subway, due to the poor lighting conditions of the dark underground with only a few strip lights above the subjects he had the fill in the shadows and change the type of light in there, so fill in flash worked perfectly and Davidson seems to underexpose the background slightly by using an F/stop of around F/22 resulting in the vignette around the images but consequently very sharp images which the colours really pop and the shadows create very sharp edges. Amazing!