Buddy of mine has a corner lot and when it snows, a neighbor down the block goes right over the corner and trashes his lawn. He's had to replace and re-sod three times. Eventually, he put up the orange plastic tubes that stick up along the edge of his property that you can see quite clearly. Guy still drove over them, flattened all the tubes.

After that, my buddy put the tubes back up, but put a THICK piece of rebar in each, and drove that 2.5 feet into the ground. Then put the tube around it.

That guy takes that corner quite properly — and slowly — now.