Many of you have seen the mysterious case of the worn out bricks on that road, 95 which goes out of NY. I can't find the exact place I took this photo, but here is the general area on street view.Here is my theory.
The mortar is stronger than the bricks, the bricks gets washed away by wind, sand and water. The mortar sticks around longer because it is stronger.
Any other ideas or reasons why this could be happening?