Re:Grid (Score 3, Interesting)

What if the grid/barcodes/whatever were painted on the ceiling instead? Just place the sensors on the top of the forklift - just have to make sure they'd still be able to see whatever they're looking for at that distance (since the distance from the forklift to the ceiling is much greater than from the tires to the floor, obviously). This would prevent the grid/barcodes from wearing down at all.