Visited this site on 04.04.04: As there was no parking I was nominated to risk my life out on the road and check this one out. After having a good stare and a bit of a rub I couldn’t make out or feel any spirals, so I took a couple of photos and ran back to the car to see if the others could make them out (no joy).
I would post my picture, but it looks the same as the ones above – without any spirals.