Fig. 3. Aerial photograph of each site type showing the intersection between a) the Hume Freeway and a secondary road with trees present in the center median of the freeway (Trees), b) the Hume Freeway and a secondary road with no trees present in the center median of the freeway (No-Trees), c) two secondary roads away from the Hume Freeway (control). (Source: GoogleTM 2009).