We have talked about the image PIA16453 before but I do not think we have discussed this path, track, or water course before or I may be totally losing it and I may have posted this already on here. If so, I am sorry and just put it down to the mind wanderings of an old codger.
However, if I have not posted this before, then this image is significant because it shows fairly clearly a path, track, or water course which has a smooth dirt base and runs for some distance top left to bottom right.