How do these magic boxes work?
They dug the road up, about 2 feet praveen says, and laid a concrete base. Just as it started drying, they started placing the elements. Neighbouring elements are supposed to be held by mates. But from the pics I've seen, there are only one type of mates. Apparently end elements have these pre-tensioning hooks, around which 40T compressive pressure will be applied so that the elements are snug.
How are these elements fastened to the floor? What prevents the elements from moving in the X and Y directions? Any guesses?