This photograph was taken by a photographer I know, Marianne Manfredi. This piece is extremely well composed. Firstly my eye is drawn towards the bike, then to the break reflector. This sounds odd but it has the most contrasting colour and tone in the image. Not only is the bike well placed considering the rule of thirds but the reflector is practically bang on the top left focal point according to divine proportions.
If you also notice the top rail of the barrier is practically horizontal (in a 2D aspect) and its perpendicularity to the closest post, it creates an L. Understanding the "L" rule, then this also draws the eye to the bike, enhancing the focal point.