While out walkies I noticed two sets of three red blobs on the footpath. Both sets have what looks like the top of a metal spike at the centre:
I would guess these have something to do with surveying. Centre mark for a theodolite or more probably nowadays a GPS receiver, but the puzzle is what is being surveyed and why?
I tried some searches on Google, even uploaded the photo, but nothing the same was found.
1 hour ago