i love it. i printed it off. when we were young and trick or treated, we did through word of mouth rate the houses as we ran into fellow tot, but we live in a small town. this could well be a city layout if anyone does do the markings. wonder if anyone has seen markings on their driveways the next day.
we used word of mouth too..passing someone at the corner.. we would exchange(very quickly ) which the best houses are in the direction you came from
those symbols are too funny..man i wish i found 1 of those on my sidewalk..too cool