Remember when visualizing it, that 1 foot x 1 foot free flow tiles will look like 4 6inch x 6inch tiles checkerboarded. I think that's why everybody calls 1x1 checkerboard on the free-flow busy.
I called, told them I was replacing my fence. They came out and painted a line down the fence line and told me be careful the utilities could be within 4 feet either side of the line.