I have seen a lot of his work; makes scale models look like they are an actual scene. Many of his shots include model buildings as well as cars. Very neat....
If you look at the table setup, you can see that he's used the table and the sheet that the models sit on as the actual sidewalk and roadway in the photo. He hasn't used any trick to remove them from the image. The photo is cropped so that the edges of the table etc don't appear in the actual photograph.