another frontier road mystery

Two years ago, I wrote about new markings on the frontier road that I found impossible to interpret, although I did make an informed guess. And guess what? A different set of markings appeared recently a short distance east of the police operational base: two sets of parallel yellow lines across the road about 35 metres apart. Although these are not standard markings, I’ve interpreted them as some kind of hazard warning.

This is what they look like:

The first photo shows the more easterly of the lines and was taken looking west. The second photo is a view looking east. The ‘SLOW’ signs were there long before the yellow lines.

So here’s the mystery: there is nothing remotely hazardous in the section between the two sets of lines, unless the possibility of a vehicle pulling out of the passing place without the driver looking first counts. However, I’ve never seen any of the passing places along the frontier road being used, and this is the only location with the yellow lines anyway. There is an accumulation of sand just west of the more westerly set of lines—presumably debris from the tipper trucks that have been using the road with increasing frequency—on which I’ve skidded a couple of times, but this could easily be swept up, if anyone could be bothered. And there are quite a few potholes—caused by the tipper trucks—but this is far from the worst section for potholes, and no other section is marked in this way.

Any suggestions as to the meaning of these lines will be most welcome.