So when I mentioned that we went 25 miles in the wrong direction, I may have not emphasized how ridiculous a mistake this was. After all, we were biking on rural highways, which are frequently unmarked. Perhaps we missed a street sign, and then biked 25 miles on an unmarked road, with no good indication that we had been following the wrong route?
Oh, no. This was a well-marked road. And not only were there route markers on a regular basis, we actually made a point of stopping at one and taking a picture. Actually, we took three pictures. And didn't once notice it was the wrong road.