Adamant1
Looking at the Mapbox photos it appears the shadow is actually shading from a change in cement material in the square area, which kind of curves down a tad on the left side. My guess is that the white line is due to a gutter or speed bump and the cement around it is darker because it was added later on when the white line was. Also, the dark area extends to the right of the white line a little, which isn't contestant with the shadows direction cast on the ground by the cars or the other gate by Evenlyn Lane, which barely  appear to cast a shadow at all and only to the left. What do you think freebeer?