So, about 5 ft (the length of his bike) is 176 odd pixels. The gap is 324 pixels (again, rougly, but a pretty good roughly) So, given that 176 pixels is 5 ftish, 1 ft must be around 35 pixels. So, 324 pixels divided by 35 pixels gives the number of feet. Rationally, with this working, i'd say this gap is about 9.257 ft. Who's a genius?